There are 20 coupons rolled up and placed inside round plastic balls in a box. There are 3 different types of coupons: 10 of them can be redeemed for "free drinks", 5 can be redeemed for "free desserts", and 5 can be redeemed for "free entrees". If you shake the box and then randomly select one coupon. What's the probability that you will get a "free entree coupon"?
(a) 25%
(b) 10%
(c) 20%
(d) 50%
(e) None of these