Lipoic acid with the following structure is a growth factor required by many organisms. Percentages of S and O in lipoic acid respectively are (atomic masses of S and O are 32.065 g $$\text{mol}^{-1}$$ and 15.999 g $$\text{mol}^{-1}$$ respectively)

A

33.03, 16.48

B

31.11, 18.24

C

31.11, 15.52

D

31.42, 15.68