Which compound has the highest percentage of carbon by mass?

A.     \({\text{C}}{{\text{H}}_{\text{4}}}\)

B.     \({{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}\)

C.     \({{\text{C}}_{\text{4}}}{{\text{H}}_{{\text{10}}}}\)

D.     \({{\text{C}}_{\text{6}}}{{\text{H}}_{\text{6}}}\)

D