Which Statement Provides the Best Rationale for Monitoring HDL and LDL

Which statement provides the best rationale for monitoring HDL and LDL as opposed to total cholesterol?

A) HDL and LDL monitoring is much cheaper than measuring total cholesterol.
B) Total cholesterol does not differentiate the amounts of "good" cholesterol and "bad" cholesterol.
C) HDL and LDL measurements are more general and frequently are used in patients not at risk for heart disease.
D) Total cholesterol measurements are often inaccurate and not as reliable as HDL and LDL.