The correct conclusion based on the article is:
B. Written communication can be an effective way for grandparents to bond with distant grandchildren.
The evidence from the text that best supports this conclusion includes:
E. In my situation, I filled the gap with hand-scribed and, later on, typed stories.
C. Long distance calls just didn't generate the right ambiance and enough time for the relaxed talking and easy listening that goes naturally with a grandpa story.
These selections indicate that the author found written stories an effective means of communication and bonding, especially given the limitations of long-distance calls.