A. He was refused admittance by the peon.
B. Admittance is refused to him by the peon.
C. Admittance was refused by the peon to him.
D. Admittance is refused him by the peon.
Given sentence is in Past simple tense and it is in active voice, we need to change it into passive voice.
Rule :
Subject + (was / were) + V3 + Optional Agents.
