A.
Remember GOOD is an ADJECTIVE modifying a NOUN. WELL is an ADVERB modifying a VERB.
His SALARY is very GOOD.
SALARY is a NOUN, so we use GOOD, because he has a GOOD SALARY.
Well:
He runs well, he speaks well, he jumps well
Good:
He is a good runner, he is a good speaker, he is a good jumper