C. and D. should be your answers. If not, its A. and B.
Hope this was helpful...
Explanation:
relative clause
it modifies noun phrase by some grammatical tools
example
my friend who is coming from America is coming to the dinner
here who is used to indicate the noun phrase
subject verb agreement
A subject and a verb must agree, even when other words or phrases come between them.
example
The flock of geese is flying south for the winter.
The subject is flock, so the verb should be is flying.
D. Audience members who stood in front of the stage to watch plays.
Answer: B
Explanation: A Extraneous detail is usually unrelated and off topic, not relevant in the text, like adding unneeded detail in a story or a report because it may be off topic or misleading
Answer:
sorry don't know
Explanation:
just trying to get points