Use reasoning to lead to the answer of the following question:
Ten telegenic contestants with a variety of personality disorders are to be divided into two “tribes” of three members each, tribe A and tribe B, for a competition. How many distinct groupings of two tribes are possible?\nOptions:\n(A) 120\n(B) 126\n(C) 252\n(D) 1200\n(E) 1260

(A)
My ans is 10C3 = 120.

So, the answer is (A)