4.Which of the following statements about UV-Vis spectrometry is correct? (3%)
(A) Absorbance （A）is defined a A = , where Po and P represent the power of the light beam that has passedthrough the solvent and the analyte-containing solution, respectively.
(B) Absorbance（A） is the reciprocal of transmittance (T); in other words, A = 1/T.
(C)The molar extinction coefficient in Beer's law in SI units is m2/mol.
(D)The molar extinction coefficient is characteristic of a molecular species and independent of the solvent.
(E)Beer's law accurately describes the absorption behavior of all solutions regardless of their analyte concentration.