Step 1: Understand the meaning.
'Noisy' means full of noise or loud sounds.
Step 2: Find the antonym.
The opposite of 'noisy' is 'quiet,' which means silent or free from noise.
Step 3: Check other options.
(A) Quit – means leave or stop.
(B) Rich – refers to wealth.
(D) Shut – means close.
Only (C) Quiet is the correct antonym.