Simplify. Answers should always have positive exponents

(x^4 y^5 z^-3)^-2

A. z^6/x^8 y^10
B. x^2 y^3/z^5
C. x^2 y^3 z^-5
D. x^6 y^7/z^6

The correct answer is C. x^2 y^3 z^-5