10x10^4x10^3x10^-5

A) 10^2
B) 10^3
C) 10^7
D) 10^13

C) 10^7

To solve this, we can add the exponents when multiplying numbers with the same base. So we have:

10^(4+3-5) = 10^7

Therefore, the answer is C) 10^7.