Answer:
A
Explanation:
The bus is being driven *by* the driver, instead of saying "a substitute driver drove the bus that day." The arrow points towards the action being performed.
I believe that it is idiom because that is a commonly used expression
Answer:
It is correlative!
Explanation:
This conclusion can be drawn since correlative sentences are like "tag-team conjunctions." They working in pairs to join phrases or words that carry equal importance within a sentence.
Answer:

Comic relief is used to give audiences some relief from serious themes and to help prepare them for the next serious scene.
Answer: True