Answer:
A. 3/4
Step-by-step explanation:
We can use complementary counting. Since there are 3 red marbles, and a total of 12 marbles, the probability of getting a red one is 3/12 or 1/4. Since we want the probability of choosing something that isn't a red marble, we take 1-1/4 which is 3/4 or a.
