Which of the following expressions is not equal to p^2?
A. P^-3 * P^5 * P^-2 * P^2
B. P^-9 * P^0 * P^2 * P^5
C. P^-3 * P^-1 * P * P^5
D. P^-5 * P^9 * P^-2 * P^0