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.

Q: The accent was thick and difficult to understand.

A: Singular
****
Q: A growl brought her attention to the remaining problem.

A: Singular
****
Q: A wrinkle formed between Adam's eyebrows as he looked away.

A:
Singular
****