A post without remuneration

A. Voluntary

B. Sinecure

C. Honorary

D. Involuntary

Answer: Option C

Solution(By Examveda Team)

One word substitute is Honorary.

Voluntary: done, given, or acting of one's own free will.
Sinecure: a position requiring little or no work but giving the holder status or financial benefit.
Honorary: (of an office or its holder) unpaid.
Involuntary: done without will or conscious control.