What is the degree of the monomial?

6x5
A. 6
B. 30
C. 5
D. 11

C. 5

The degree of a monomial is determined by the sum of the exponents of its variables.

In this case, the monomial is 6x^5. The variable is x, and the exponent is 5.

Therefore, the degree of the monomial 6x^5 is 5.

So, the correct answer is C. 5.