Final answer:
The degree of a monomial is determined by the exponent of the variable. In this case, the degree of the monomial 6x⁵ is 5. Hence, C) is correct.
Step-by-step explanation:
The degree of a monomial is determined by the exponent of the variable. In this case, the monomial is 6x⁵. The exponent of x is 5, so the degree of the monomial is 5. The coefficient, which is 6, does not affect the degree.