Final answer:
The set a) 'while we were driving around' is a dependent clause, b) 'while driving around' is a phrase, and c) 'we were driving' is an independent clause. An independent clause forms a complete idea, a dependent clause relies on an independent clause, and a phrase does not include both a subject and a verb.
Step-by-step explanation:
The matching of the sets of words to their proper category would be as follows:
An independent clause can stand on its own as a complete sentence because it expresses a complete thought. It has both a subject and a verb that form a complete idea. "We were driving" is an independent clause since it contains a subject ('we') and a verb ('were driving') and can function as a standalone sentence.
A dependent clause, also known as a subordinate clause, cannot stand alone as it does not provide a complete thought. It depends on an independent clause to give it full meaning. "While we were driving around" starts with the subordinating conjunction 'while' and contains a subject and a verb, but it cannot stand alone; it is a dependent clause. Lastly, phrases are groups of words that don't contain both a subject and a verb together and cannot stand alone as a sentence. "While driving around" lacks a subject and functions as a participial phrase, thus it is a phrase.