6502. He was dismissed from service because they found him dishonest.

✅ The correct answer is option B.
Prevented : keep (something) from happening.

Removed : take (something) away or off from the position occupied.

Retired : having left one’s job and ceased to work.

Stopped : (of an event, action, or process) come to an end; cease to happen.

Dismissed : remove from employment or office, typically on the grounds of unsatisfactory performance.

Synonym of Dismissed is Removed