Adeola doesn't have to go to the farm today.

Step 1: Analyze the question The sentence is "Adeola doesn't have to go to the farm today." We need the option that best matches its meaning.

Step 2: Explain the concept "Don't/doesn't have to" expresses lack of necessity. It means there is no obligation. The person is free to go or not go. It is very different from "must not", which expresses prohibition.

• doesn't have to = not obligatory (a choice)
• must not = forbidden
• should not / ought not to = advice or moral suggestion against doing something

Step 3: Check each option

• A. Adeola may go to the farm today if he so wishes. It is not compulsory, but he is free to go if he wants. This matches the meaning.
• B. Adeola ought not to have gone to the farm today. This criticizes a past action, which changes both the tense and the meaning. ✗
• C. Adeola must not go to the farm today. This is a prohibition, the opposite of "no obligation". ✗
• D. Adeola should not go to the farm today. This is advice against going, but the original sentence does not discourage him. ✗

Step 4: Answer The correct option is A.

Tip: In JAMB "Lexis and Structure" questions, remember this trick:

• Don't have to = not necessary (you may or may not)
• Must not = forbidden

Students often confuse these two, and examiners like to test the difference.