Question

When are the parades this summer?

What is the subject?

A: summer


B: parades


C: this


D: when

Answer 1

a- summer
This is not the subject because the question doesnt specifically ask about the summer
b-parades
This is the topic becase the question is specifically asking about the parades
c-this
Obviously this is not the subject it is just an adjective
d-when
This is not the subject because when is a preposition

Answer 2

Hello!

The subject is the topic that is being talked about so, "when" is not a topic, it's a question so that is not it. "This" is obviously not a subject either, so that's out. The question is about parades, and it is asking when it is which is summer. So that leaves you with Parades as that is what the question is about.

I hope this helped,

I am, yours most sincerely,
SuperHelperThingy