Final answer:
The molar extinction coefficient from Beer's Law plot is a constant.
Step-by-step explanation:
The molar extinction coefficient from Beer's Law plot is a constant (option b).
The molar extinction coefficient, also known as molar absorptivity (ɛ), is a characteristic value for a given compound.
It represents the relationship between the concentration of a sample and the absorbance (A) of light passing through the sample.
It is constant for a specific compound and is used to determine the concentration of the compound in a solution.