Answer:
Explanation:
Let's start with the answer. It has to be D.
The key sentence is this one:
My children are fresh to the adult world, and when I see their tears as plans go sideways, I like to imagine that someday they’ll sit where I am with people to love, hobbies to pursue, and maybe even a spare dollar in the bank.
He's calm because he's been through it all before. Most of all, he knows that this to will end -- whatever problems his children have are only momentary. (As an aside, I would like to hear what his wife says).
A: Not the answer. He doesn't ignore the troubles. If he believes it happens for a reason, he doesn't say what it is.
B: Not the answer: Nowhere does it say anything about future considerations or at least that one.
C: He doesn't fear for them. He has a calm confidence that they will work through it. Not the answer.