The total pressure inside a vessel containing a mixture of neon, argon, and helium gases is 750 kPa. The partial pressure of neon is 230 kPa, and the partial pressure of argon is 250 kPa. What is the partial pressure of helium?

A. 480 kPa
B. 270 kPa
C. 500 kPa
D. 520 kPa
E. 325 kPa