Member of a band of robbers

Answer: Option B

One word substitute is Brigand.

Dacoit: (in India or Burma (Myanmar)) a member of a band of armed robbers.
Brigand: a member of a gang that ambushes and robs people in forests and mountains.
Thief: a person who steals another person's property, especially by stealth and without using force or threat of violence.
Pirate: a person who attacks and robs ships at sea.