The higher the "C" factor of a pipe, the _____________ the pipe and the greater the carrying capacity of the pipe.

The correct answer is that the higher the "C" factor of a pipe indicates that the pipe is smoother. The "C" factor, also known as the coefficient of roughness, is a measure used in hydraulic calculations to represent the relative smoothness of a pipe's interior surface. When the pipe is smoother, water can flow through it with less friction, which increases the overall flow rate and carrying capacity of the pipe.

In contrast, a rougher pipe surface would add turbulence and resistance to the flow, which would decrease the carrying capacity. Therefore, a higher "C" factor is preferred in applications where efficient water transport is necessary, as it allows for a more streamlined flow with minimal energy loss due to friction. Understanding the impact of the "C" factor is crucial for designing piping systems that need to optimize flow efficiency.