TASK DEFINITION: In this task you are given a sentence. You must judge whether subject of the main clause is singular or plural. Label the instances as "Singular" or "Plural" based on your judgment.
PROBLEM: The vote was quick and it passed.

SOLUTION: Singular

PROBLEM: What if the authorities hadn't bought the story ?

SOLUTION: Plural

PROBLEM: The most coherent theory was one he recalled from his nurse when he was small.

SOLUTION:
Singular