The peon refused him admittance.

He was refused admittance by the peon

Admittance is refused to him by the peon

Admittance was refused by the peon to him

Admittance is refused him by the peon

All of the above

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