Concept:A synonym is a word that means the same or nearly the same as another word. Here, we need the word that matches the meaning of "Defer".
Explanation:"Defer" means to postpone or put off an action or decision to a later time.
Look at the options one by one.
"Delay" also means to make something happen later than planned.
"Decline" means to refuse politely.
"Reject" means to dismiss or not accept.
"Proceed" means to move forward or continue.
Only "Delay" shares the same idea of postponing.
Hence, "Defer" and "Delay" are synonyms.
Answer:B. Delay