d. 6
The code for i in range(0, 12, 2): iterates over a range starting from 0 (inclusive) and ending at 12 (exclusive) with a step size of 2. This means it will iterate over the values 0, 2, 4, 6, 8, and 10. There are 6 iterations in total, so the statement print("Hi, again!") will be executed 6 times, resulting in "Hi, again!" being displayed 6 times.