Classify Each Alkene in Vitamin D₃ Labeled I, II, III

Multiple Choice

Classify each alkene in vitamin D₃ labeled I, II, III by the number of carbon substituents bonded to the double bond.

A) I = Disubstituted; II = trisubstituted; III = trisubstituted.
B) I = Monosubstituted; II = disubstituted; III = trisubstituted.
C) I = Disubstituted; II = disubstituted; III = trisubstituted.
D) I = Disubstituted; II = trisubstituted; III = disubstituted.