Correct Option: B. Evidence of a former headmaster's secrets Detailed Explanation: In Chapter 5 of "The Lekki Headmaster," the protagonist uncovers significant evidence related to the former headmaster's secrets. This discovery is pivotal as it sheds light on the mysterious occurrences that have been troubling the school.

1. Context of the Discovery: The protagonist, who is likely a new headmaster or a teacher, has been observing strange happenings within the school environment. These occurrences may include unexplained noises, missing items, or unusual behavior from students and staff. The protagonist's investigation leads them to delve into the history of the school and its previous leadership.
2. Nature of the Evidence: The evidence found could include old documents, letters, or artifacts that reveal hidden aspects of the former headmaster's administration. This might involve unethical practices, hidden agendas, or unresolved conflicts that have lingering effects on the current school environment.
3. Impact of the Discovery: This revelation is crucial as it not only explains the mysterious occurrences but also provides a deeper understanding of the school's culture and the challenges the protagonist faces. It sets the stage for potential conflict resolution and character development, as the protagonist must navigate the implications of this newfound knowledge.

Why Other Options Are Incorrect:

• A. A hidden treasure map: While a treasure map could lead to an exciting adventure, it does not directly relate to the mysterious occurrences affecting the school. The focus of the narrative is more on the school's history and the impact of past leadership rather than a quest for treasure.
• C. A snake residing in the roof: Although this could be a literal interpretation of a mysterious occurrence, it is more of a physical problem rather than a deeper issue related to the school's history or administration. The narrative is likely aiming for a more profound exploration of themes rather than a simple animal-related mystery.
• D. A secret passage leading outside: While secret passages can add an element of intrigue, they typically serve as plot devices for adventure rather than addressing the core issues within the school. The protagonist's discovery is more about understanding the past and its implications for the present rather than finding a way out of the school.

Revision Summary:

• The protagonist discovers evidence of a former headmaster's secrets, which explains the mysterious occurrences in the school.
• This discovery highlights the importance of understanding the school's history and its impact on current events.
• Other options, such as a treasure map, a snake, or a secret passage, do not address the deeper issues at play in the narrative.
• The chapter emphasizes themes of conflict resolution and character development through the protagonist's journey of uncovering the truth.