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 A

The probability of drawing the first red marble is 5/8. After one red marble is removed, there are 4 red marbles left out of a total of 7. The probability of drawing a second red marble is 4/7. The combined probability is (5/8) * (4/7) = 20/56 = 5/14.