INTIMIDATE

Answer: Option B

Hint : a slight or indirect indication or suggestion.
Frighten : make (someone) afraid or anxious.
Bluff : an attempt to deceive someone into believing that one can or is going to do something.
Harass : subject to aggressive pressure or intimidation.
Intimidate : frighten or overawe (someone), especially in order to make them do what one wants.

Synonym of Intimidate is Frighten