Put the following equation in standard form: x^5 + 2x^3 + 6x + 1/5.

A. It already is in standard form
B. 6x + 2x^3 + x^5 + 1/5
C. 6x + 2x^3 + x^5 + 1/5 + 0x^2
D. 1/5 + 6x + 0x^2 + 2x^3 + x^5