I would say A is the right one
D. Glistened and sparkled
Talk: if the word "did"(helping verb) is in front of the word it is meaning that someone spoke in the past, but if the helping verb "will" is before the word it means that someone is going to speak in the future (most likely about to start talking)
talk-"ing": the same thing as "talk" EXCEPT "ing" is a suffix which means presently, so "talking" means that someone is currently speaking.
talk-"ed": once again the same thing, however, the suffix "ed" means already DID or in the past.
talk- "en": actually this is sadly not an english word, but the suffix "en" means made of. For example, "golden" means MADE OF gold.
Hope this helped:)
B. he describes his son's rare mathematical background
