The sentence that shows correct subject-verb agreement is My favourite thing to cook is desserts. Hence, Option A is correct.
The sentence, which is grammatically correct, comes under the subject-verb agreement. It basically has certain rules like If the subject is singular, the verb must be singular too. If the subject is plural, the verb must also be plural.
Most of the time, the problem in the subject-verb agreement that arises is in the present-tense sentences. Per the rules of grammar, verbs in the past tense don't change as much when the number of subjects changes. For instance, "He walked" is the same verb form as "They walked."
Therefore, Option A is correct.
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