The caretaker of a public building needs to a vigilant and an honest person.

A. Custodian

B. Curator

C. Watchman

D. Dean

Answer: Option A

Solution(By Examveda Team)

One word substitute is Custodian.

Custodian: a person who has responsibility for taking care of or protecting something.
Curator: a manager or overseer.
Watchman: a man employed to look after an empty building, especially at night.
Dean: the head of a university faculty or department or of a medical school.