Answer:
A
Explanation:
which number multiplied by itself three times will give 64?
a * a * a = 64
Start by noticing that 32 is far too large.
32 * 32 * 32 = 32768
By the same reasoning, 21 is likely too big as well.
What about 8
8 * 8 * 8 is too big as well 8 * 8 is 64 and you still need to multiply by another 8.
So just by elimination, the answer is a