Which Statement Concerning Phospholipid Synthesis Is True

Which statement concerning phospholipid synthesis is true?

A) Addition of polar "head groups" to diacylglycerol usually involves CDP derivatives.
B) Addition of polar "head groups" to diacylglycerol usually involves UDP adducts.
C) Addition of fatty acyl "tails" to glycerol usually involves CDP adducts.
D) Addition of fatty acyl "tails" to glycerol usually involves UDP adducts.
E) None of the above is true.