Answer :
The sentence 'a small group of my classmates looked at the problem and solved it in a few minutes' is a b.simple sentence.
In the field of English grammar, such a sentence that contains a subject, verb, and object is referred to as a simple sentence.
We can recognize a sentence to be a simple sentence if it is made of one independent clause. An independent clause can be described as a clause that can stand alone and does not require the dependent clause to make sense.
The sentence mentioned in the question is a single sentence that depicts complete meaning as an independent clause, hence it is a simple sentence.
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