In the extra mitochondrial synthesis of fatty acids, CO2 is utilized?

(A) To keep the system anaerobic and prevent
regeneration of acetyl CoA
(B) In the conversion of malonyl to CoA
hydroxybutyryl CoA
(C) In the conversion of acetyl CoA to malonyl
CoA
(D) In the formation of acetyl CoA from 1 carbon
intermediates