Question

A group of words with a subject and verb that does not express a complete thought is called a(n)

Answer 1

This is  called a dependent (another word: subordinate) clause.

For example, in a sentence

When I ask questions on Brainly, people answer them.
 
"When I ask questions on Brainly, " is a group of words with a subject and a verb, but does not express a full thought.

Answer 2

The answer is C. Depandant Clause