the answer on the dump are C&D
I think C isn't correct and B is correct
Any Clue ??
EIGRP auto summarization is the default behaviour in EIGRP. ( https://learningnetwork.cisco.com/thread/49439 )
Concerning B answer, there's no reference to the command "aggregate-address" but just to the additional parameter "summary-only".
I would still stay with C-D.