This morning, half of the members of the team _______ decided to quit.
Which of the following options correctly completes the sentence above?

Question

Quizplus · Accepted Answer

A collective noun is a collection of things that are acknowledged as a whole, such as class, group, tour, pack, family, etc. 
When the subject is a collective noun, we use a singular verb if we view the noun as a whole and a plural verb if we view the noun as a collection of individuals.
 In this sentence, we are not talking about the whole team as a singular entity, so we use a plural verb (have decided). 
The helping verb "has" would be used with a singular subject.
The verb "is" would be used with a singular subject.
The verb phrase "has been" would be used with a singular subject.

This Morning, Half of the Members of the Team _______