Answer: It is the third answer, (8,16,24,32,40,48)
Explanation:
Multiples are numbers that can be divided by a number (your problem 8) without a remainder. So 8 can be divided by 8 to get 1, 16 can be divided by 8 to get two, and so on.
It wouldn’t be the last answer since it has to be under 50 and 56 is higher than 50. I hope this helps :)