He was sentenced to four year's imprisonment.

Answer: Option A

Punished : inflict a penalty or sanction on (someone) as retribution for an offence, especially a transgression of a legal or moral code.
Acquitted : free (someone) from a criminal charge by a verdict of not guilty.
Assigned ; allocate (a job or duty).
Convicted : having been declared guilty of a criminal offence by the verdict of a jury or the decision of a judge.
Sentenced : declare the punishment decided for (an offender).

Synonym of Sentenced is Acquitted