The correct answer is (B) To exclude; to shun; to keep from society, privileges, etc.; to refrain deliberately from having sociable contact with, particularly in order to punish. To banish, expatriate.

Ostracize comes from Greek Ostrakizein (to banish).

Examples of use:

• Once the police had charged Elizabeth, her friends ostracized her.
• Most inhabitants ostracized him after he openly criticized the village elders.