In a group of 800 people, 2/5 play at least one instrument, 96 play two or more. What is the probability that one student play exactly one instrument?
Choose the correct answer:  A) 2 / 125  B) 3 / 125  C) 2 / 25  D) 3 / 25  E) 7 / 25

Rationale: "p ( playing 2 or more instruments ) = 96 / 800 = 3 / 25 . then , the probability of playing exactly one instrument is given by : p ( playing 1 or more instruments ) - p ( playing 2 or more instruments ) = 2 / 5 - 3 / 25 = 7 / 25 . answer e ."
Answer: E