Which equation shows that the Pythagorean identity is true for 0 = 180°? Select the equation that is in the form sin^2 0 + cos^2 0 = 1.

O A. 1^2 + 0^2 = 1
O B. 0^2 + 1^2 = 1
O C. 0^2 + (-1)^2 = 1
D. (-1)^2 + 0^2 = 1