Chlorophyll,the Substance Responsible for the Green Color of Leaves,has One

Chlorophyll,the substance responsible for the green color of leaves,has one magnesium atom per chlorophyll molecule and contains 2.72% magnesium by mass.What is the molar mass of chlorophyll?

A) 24.3 g/mol
B) 20.2 g/mol
C) 2020 g/mol
D) 8.94 g/mol
E) 894 g/mol