In Some Experiments,why Are Biomarkers Used Instead of the Presence

In some experiments,why are biomarkers used instead of the presence or absence of disease (also known as disease outcomes) ?

A) Biomarkers more accurately reflect disease risk than actual disease outcomes.
B) Biomarkers respond to diet more slowly than actual disease outcomes.
C) Although biomarkers are not as conclusive as directly measuring disease outcomes,they respond to changes in diet more rapidly
D) Biomarkers are as conclusive as disease outcome and they are easier to measure