Which Factor Promotes the Formation of Ketone Bodies

Which factor promotes the formation of ketone bodies?

A) Oxaloacetate,a compound which prevents acetyl CoA from entering the citric acid cycle.
B) Glucose,a compound which promotes the entry of acetyl CoA into the citric acid cycle.
C) The absence of oxaloacetate,an absence which prevents acetyl CoA from entering the citric acid cycle.
D) The absence of free fatty acids from adipose tissue.