Step 1: Subject-Verb Agreement.
The subject "Lots of fruits" is plural, so it requires a plural verb.
Step 2: Checking options.
(A) are — correct.
(B) is — wrong (singular).
(C) have — wrong form.
(D) has — wrong singular form.
Step 3: Conclusion.
Correct answer is (A) are.
Identify the part of the sentence that contains a grammatical error:
Each of the boys have submitted their assignment on time.