【Answer】：d
【Explanation】：A fair die has six equally likely outcomes: 1, 2, 3, 4, 5, and 6. The event of obtaining a 3, 4, or 5 consists of three outcomes. Therefore, the probability of this event is the number of favorable outcomes (3, 4, or 5) divided by the total number of outcomes (six possibilities from the die). This gives us a probability of 3/6 or 1/2. So, the correct answer is option d, which is 1/2.
