Use plural verbs for ________.

Question

words such as pants and eyeglasses
titles of written works
words such as economics and physics
an amount as a subject

my answer

An amount as a subject

Answer 1

Would you say "one are" or "each are"?
Each of these is an "amount".

Look at the other words used as possible subjects.

Would you say Words are, titles are ?

This question is not really clear...

Answer 2

All of these use plural verbs. Which one is correct?

My pants are hanging in the closet.

All the King's Men were written by Robert Penn Warren.

Economics are a hard subject.

Five dollars are a lot to pay for a Coke.