There are 12 slate rocks, 16 pumice rocks, and 8 granite rocks randomly distributed in a certain field. If 2 rocks are chosen at random and without replacement, what is the probability that both rocks will be slate rocks? Choose the correct answer:
A) 3 / 32
B) 7 / 64
C) 11 / 105
D) 15 / 127
E) 19 / 134

Rationale: 12 / 36 * 11 / 35 = 11 / 105 the answer is c .
Answer: C