I would say D. Blaming others, because the other responses Are important characteristics of good mental and emotional health and D is the only one that isn't.
I think their probably stressed out about life.
Progressively Overloading his muscles, assuming he is doing weight training, to increase strength over time. he should not stay with the same weight for two months, unless he can perform more reps with better form over time.
The answer is cardio respiratory endurance :)
