At a party, 13 guests brought wine and 14 guests brought beer. If exactly 11 guests brought only one of the two types of drinks, how many guests brought both types of drinks? Choose the correct choice from the following answers:
A) 5 B) 6 C) 7 D) 8 E) 14

Rationale: say x guests brought both drinks . ( 13 - x ) + ( 14 - x ) = 11 - - > x = 8 . answer : d .
Answer: D