Correct Answer: B

Explanation: To solve this problem, we can use the concept of complementary probability. The complementary probability of an event is the probability that the event does not happen. It's often easier to calculate the probability of the complement and then subtract it from 1 to find the probability of the event we're interested in. In this case, we want to find the probability of rolling an even number at least once in three rolls of a fair 6-sided die. The complement of this event is not rolling an even number in any of the three rolls. An even number on a 6-sided die can be 2, 4, or 6, so the probability of rolling an even number on one roll is 3 out of 6, or 1/2. Conversely, the probability of rolling an odd number (1, 3, or 5) is also 1/2. The correct probability of not rolling an even number in three rolls is ​. Therefore, the probability of rolling at least one even number is ​.