Answer:
B. 8
Step-by-step explanation:
The principal square root is another word for the positive square root. The square root of a number is the number that equals a given number when multiplied by itself.
In this case, 8*8 = 64. -8*-8 also equals 64, but we are looking for the principal square root here, so the only answer is 8.
Hope this helps!
