To determine which statements about agricultural development are true, let's analyze each statement one by one and see how they relate to the concept of agricultural development. Statements Analysis:

1. Increased processing of produce (Statement I):
2. Agricultural development often involves improving the methods and technologies used in farming and food production. This includes not only growing crops but also processing them into various forms (like turning wheat into flour or tomatoes into sauce). Increased processing can lead to better preservation, value addition, and marketability of agricultural products. Therefore, this statement is true.
3. Increased food production (Statement II):
4. One of the primary goals of agricultural development is to enhance food production. This can be achieved through improved farming techniques, better seed varieties, and the use of fertilizers and pesticides. As a result, agricultural development typically leads to an increase in the quantity of food produced. Thus, this statement is also true.
5. High productivity (Statement III):
6. Agricultural development aims to increase productivity, which refers to the amount of output (crops, livestock, etc.) produced per unit of input (land, labor, capital). High productivity is a direct result of advancements in technology, better resource management, and improved agricultural practices. Therefore, this statement is true as well.
7. Increased agricultural labour force (Statement IV):
8. While agricultural development can create jobs and may lead to an increase in the agricultural labor force in some contexts, it can also lead to the opposite effect. For instance, mechanization and the adoption of advanced technologies can reduce the need for manual labor, as fewer workers are needed to produce the same amount of food. Therefore, this statement is not necessarily true in all cases.

Conclusion on Options: Now, let's evaluate the options based on the analysis above:

• Option A: I, II and III only - This option includes all the true statements (I, II, and III) and excludes IV, which is correct.
• Option B: I, II and IV only - This option incorrectly includes IV, which is not universally true.
• Option C: I, III and IV only - This option also incorrectly includes IV.
• Option D: II, II and IV only - This option is incorrect as it repeats II and includes IV.

Final Answer: The correct option is A. I, II and III only. Summary of Key Points:

• Agricultural development leads to increased processing of produce, enhancing value and marketability.
• It significantly increases food production through improved techniques and technologies.
• High productivity is a key goal of agricultural development, resulting from better resource management.
• The statement about an increased agricultural labor force is not universally true, as mechanization can reduce labor needs.

Revision Summary:

• Agricultural development enhances processing, food production, and productivity.
• Increased processing adds value to agricultural products.
• High productivity is achieved through better farming practices.
• The impact on the agricultural labor force can vary, sometimes leading to a decrease due to mechanization.