Which two statements contradict each other?

I. Jon, Elizabeth, and Franco read 27 books among them for a class.
II. Franco read 6 books.
III. None of the three students read more than 7 books.
A. I and II

B. I and III

C. II and III

D. No two of the statements contradict each other.

Question

Which two statements contradict each other? 

I. Jon, Elizabeth, and Franco read 27 books among them for a class. 
II. Franco read 6 books. 
III. None of the three students read more than 7 books. 
 A. I and II  
 
 B. I and III  
 
 C. II and III  
 
 D. No two of the statements contradict each other.

anonymous · Answer

I keep questioning myself on this one. Can someone clarify?

anonymous · Answer

The answer is B.
If III were true, the students could have read at most 21 books, however I states that they read 27 books in total, so at least 1 person has read more than 7 books).

anonymous · Answer

thank you SO much!