Which of the Following Is True of Sphingolipid Synthesis

Which of the following is true of sphingolipid synthesis?

A) All of the carbon atoms of palmitate and serine are incorporated into sphingosine.
B) CDP-sphingosine is the activated intermediate.
C) CO₂ is produced during the synthesis of ceramide from palmitate and serine.
D) Glucose 6-phosphate is the direct precursor of the glucose in cerebrosides.
E) Phosphatidic acid is a key intermediate in the pathway.