A cause of great trouble or suffering.
Answer:
That's a phrase. Phrases don't have a subject-verb component ........ unlike clauses, which DO have both.
Explanation:
phrase:
My younger brother (no verb)
sat on the floor (no subject)
clause:
My younger brother sat on the floor.
Answer:
C
Explanation:
if this is wrong do not crucify me, but I just do not see the need of a comma unless being followed by a conjunction. (They do not give the option)
Answer:
I would say C because you wouldn't know if the reader knew more or didn't at all.