What kinds of questions should you ask during a collaborative discussion? questions that encourage debates
questions on which everyone must agree
questions that clarify other people’s responses
questions that require a yes or no answer

questions on which everyone must agree on

Explanation:

Because it's a discussion right? the goal of a discussion is basically coming up something we can all agree on

true. the definition explains it: a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. this is a dictionary definition that i have looked up in a dictionary.