Answer:
it has to be D he regularly meets his own goals
Explanation:
that's why he could be happy
Endocrinologists is the specialist doctor you should go see
It would be best to take it to a vet and ask if he has anything on him, or if he is going through some sort of emotional state
A:2 if you have no anxiety, you feel better.
B:1 Increasing work productivity will help engage your brain more
C:3 Encouraging yourself will make you feel better about yourself.