A bag contains 5 red marbles and 3 blue marbles. If two marbles are drawn at random without replacement, what is the probability that both marbles are red?

✓ Correct Answer: Option B

Total marbles = 5 + 3 = 8. Probability of drawing the first red marble is 5/8. After drawing one red marble, there are 4 red marbles left and 7 total marbles. Probability of drawing a second red marble is 4/7. The probability of both events is (5/8) * (4/7) = 20/56 = 5/14.