A. and C.
As French was still struggling with the damage caused in WW1
The correct answer is compulsion.
In terms of addictions, compulsion refers to an intense and overwhelming urge to do something. Addictions lead to compulsions to perform an action and fulfill one's urges. In this instance, despite having something else scheduled at the time of his workout, Steve feels compelled to give into his addiction (exercising) by trying hard to find time for it.
You didn't give any options to chose from,but light stretching or jogging are good warm ups.You don't want to over work before your muscles are warmed up.