Sunil spent most of his time in recreation.

Answer: Option B

Recreation : activity done for enjoyment when one is not working.
Work : activity involving mental or physical effort done in order to achieve a purpose or result.
Boredom : the state of feeling bored.
Leisure : time when one is not working or occupied; free time.
Diversion : the action of turning something aside from its course.

Antonym of Recreation is Boredom