The correct answer is B. suspension.
An appointment is the act of assigning someone to a position or office. A suspension is the act of temporarily removing someone from their position or office.
Disappointment is the feeling of sadness or displeasure caused by the nonfulfillment of one’s hopes or expectations. Dismissal is the act of discharging someone from their job. Discharge is the act of releasing someone from a hospital or prison.
In conclusion, the antonym of appointment is suspension. This is because a suspension is the opposite of an appointment. An appointment is the act of assigning someone to a position or office, while a suspension is the act of temporarily removing someone from their position or office.