Concept:The word "clandestine" refers to something done in a hidden or secret manner.
Explanation:The sentence states that the aggrieved faction held a "clandestine" meeting.
The word "clandestine" means kept secret or done secretly, especially when the activity is private or unofficial.
Now examine each option.
"Secret" means not known or not meant to be known by others.
"Quiet" means making little or no noise, which does not match the idea of secrecy.
"Quick" means fast or speedy, which is unrelated to the meaning.
"Brief" means short in duration, which is also not related to secrecy.
Thus, the word nearest in meaning to "clandestine" is "secret."
Answer:A. secret