Опрос от журнала "8 часов": "Чем Вы питаетесь на работе?"

Triplet Triathlon
Triplets Adam, Bruce, and Charlie enter a triathlon. If there are 9 competitors
in the triathlon, and medals are awarded for first, second, and third place,
what is the probability that at least two of the triplets will win a medal?

(A) 3/14
(B) 19/84
(C) 11/42
(D) 15/28
(E) 3/4