The error lies in part B of the sentence. Hence, the correct answer is option 3. The error lies in part B of the sentence because the rule of subject-verb agreement is violated here. Subject-verb agreement: The subject-verb agreement rule says that if the subject is singular, its verb must also be singular; and if the subject is plural, its verb must also be plural. when two nouns joined by and represent a single entity or emotion, the verb is kept as singular. So, ‘are’ should be replaced by ‘is’ in part B. Thus, the correct sentence is- Idli and sambhar is cooked in the mess of our hostel daily despite the fact that nobody likes to eat it.