The correct option is B Brigand
A brigand is a member of a gang that ambushes and robs people in forests and mountains. For example, "And they defeated the genius Napoleon and, suddenly recognizing him as a brigand, sent him to the island of St. Helena". Hence, Option B is correct. Among the rest of the options, dacoit means (in India or Burma (Myanmar)) a member of a band of armed robbers, thief means a person who steals another person's property, especially by stealth and without using force or threat of violence, pirate means a person who attacks and robs ships at sea. These options do not express this meaning, hence incorrect.