Answer:
B
Step-by-step explanation:
This is because the difference of two squares follows the general equation of (x-a)^2 - a^2 - c
It's a
[tex] \frac{1}{4} {x}^{2} - 1[/tex]
[tex]{( \frac{1}{2} x)}^{2} - {1}^{2} [/tex]
