A student gets fingerprints on a cuvette before using it to determine the concentration of a coloured species using its known extinction coefficient. What is the effect on the absorbance and reported concentration?

Absorbance         Reported concentraion 

Absorbance is directly proportionate to the substance's concentration, according to the relationship between concentration and absorbance. The absorbance of a substance increases with its concentration. This is due to the fact that the quantity of molecules with which light interacts determines the amount of light that is absorbed.

Hence, option B is correct.