I'm assuming 6(8) is 6^8, and none of the other answers are correct, so the answer is 6(8). This is because you are not multiplying 6 by 8, you are multiplying 6 by 6, but you're doing it 8 times. For example 6 × 6 = 36, 36 × 6 = 216, etc. I hope this helps!
