The answer is A) Passion.
Step-by-step explanation:
Part of the reason we know this is the answer is because infatuation means “a feeling of foolish or obsessively strong love for, admiration for, or interest in someone or something” (Merriam-Webster Dictionary), which makes sense with the sentence. The other way to know is because, if you insert the other words, none of them make sense with the context of “-a passion he shared with his family”.