When average age of 24 members are 0, how many members greater than 0?  Choose the correct option: A) 17 B) 23 C) 21 D) 24 E) 25

Rationale: "average of 24 numbers = 0 . sum of 24 numbers ( 0 x 24 ) = 0 . it is quite possible that 23 of these numbers may be positive and if their sum is a then 24 th number is ( - a ) answer is 23 ( b )"
Answer: B