Correct Option: B. Habitat restoration Detailed Explanation: Why Habitat Restoration is the Correct Answer:

1. Definition of Habitat Restoration: Habitat restoration involves the process of returning a degraded or damaged ecosystem to a stable, healthy state. This can include replanting native vegetation, removing invasive species, and rehabilitating soil and water quality.
2. Promoting Biodiversity: Biodiversity refers to the variety of life in a particular habitat or ecosystem. Habitat restoration is effective in promoting biodiversity because:
3. Re-establishes Native Species: By restoring habitats, we create conditions that allow native species to thrive. Native species are adapted to local conditions and are crucial for maintaining the ecological balance.
4. Improves Ecosystem Services: Healthy ecosystems provide essential services such as pollination, water purification, and carbon sequestration. These services support a wide range of organisms, thus enhancing biodiversity.
5. Creates Habitats for Various Species: Restoration can create diverse habitats (like wetlands, forests, and grasslands) that support different species, from plants to animals, thereby increasing overall biodiversity.
6. Long-term Sustainability: Restoration efforts often lead to sustainable ecosystems that can support diverse life forms over time. This contrasts with practices that may provide short-term benefits but ultimately degrade the ecosystem.

Why the Other Options are Incorrect or Weaker: A. Monoculture Planting: - Definition: Monoculture planting involves growing a single crop or species over a large area. - Impact on Biodiversity: This practice significantly reduces biodiversity because it eliminates the variety of species that would naturally coexist in an ecosystem. Monocultures are more susceptible to pests and diseases, which can lead to further ecological imbalance. C. Increased Use of Pesticides: - Definition: Pesticides are chemicals used to kill pests that threaten crops. - Impact on Biodiversity: While pesticides can protect certain crops, they often have harmful effects on non-target species, including beneficial insects (like pollinators), birds, and aquatic life. The increased use of pesticides can lead to a decline in biodiversity as these chemicals disrupt food webs and harm various organisms. D. Urban Development Expansion: - Definition: Urban development refers to the growth of cities and towns, often involving the conversion of natural habitats into residential, commercial, or industrial areas. - Impact on Biodiversity: Urban expansion typically leads to habitat destruction, fragmentation, and pollution, all of which negatively impact biodiversity. Natural habitats are replaced with buildings and roads, which can isolate species and reduce their populations. Summary of Key Points:

• Habitat restoration is the most effective strategy for promoting biodiversity as it focuses on rehabilitating ecosystems to support a variety of species.
• Monoculture planting reduces biodiversity by promoting a single species, making ecosystems more vulnerable.
• Increased use of pesticides harms non-target species and disrupts ecological balance, leading to a decline in biodiversity.
• Urban development expansion destroys natural habitats, leading to habitat loss and fragmentation, which further threatens biodiversity.

By focusing on habitat restoration, we can create healthier ecosystems that support a wide range of life forms, ensuring the sustainability of our natural environments.