NEED HELP IN UNDER 10 MIN

Which quotation best shows that Mr. Coates realizes the pain his son is enduring over Old Yeller's death?

A.
"'And I'm mighty proud to learn how my boy stood up to it.'"

B.
"'You couldn't ask any more of a grown man.'"

C.
"'It's not a thing you can forget. I don't guess it's a thing you ought to forget.'"

D.
"'Now the thing to do is to try to forget it and go on being a man.'"