Read the following context and choose the best option to answer the question.
Context: Sad I know . He 's so intelligent , and he 's become somewhat of my professional mentor . For four years now , we ' ve been meeting in hotels , my office , parking lots , fake business trips etc . , and little by little we ' ve gotten to know eachother . He 's not a big sharer - neither am I ( well , not normally ) , so it 's taken us some time , but we ' ve become very close .
Question: What may be the reason he s not a big sharer ?
Options: 
A. He has alot of deep dark secrets .
B. He has nothing to share that s good .
C. He has alot of top secret information .
D. He likes to keep things to himself .


D