The stableman at the inn was the only witness to the murder.

A. Butler

B. Ostler

C. Imposter

D. Jockey

Answer: Option B

Solution(By Examveda Team)

One word substitute is Ostler.

Butler: the chief manservant of a house.
Ostler: a man employed to look after the horses of people staying at an inn.
Imposter: a person who pretends to be someone else in order to deceive others, especially for fraudulent gain.
Jockey: a person who rides in horse races, especially as a profession.