Oxalic Acid Is Found in Many Plants, Like Spinach and Black

Multiple Choice

Oxalic acid is found in many plants, like spinach and black tea.  What is the mass of the carbon found in one mole of oxalic acid, H₂C₂O₄?

A) 12.01 g of C
B) 24.02 g of Cl
C) 45.01 g of C
D) 90.02 g of C