Admittance was refused to him by the airport security.
5Select the option that expresses the given sentence in active voice.
Admittance was refused to him by the airport security.
The given sentence is in Simple Past tense.
The structure of active and passive forms in Simple Past tense is as follows:
Active: Subject + V2 + Object
Passive: Object + was/were + V3 + by + Subject
Example:
Active: Our teacher taught this chapter in the last class.
Passive: This chapter was taught by our teacher in the last class.
Hence, the option that expresses the given sentence in active voice is The airport security refused him admittance.