Four of the Ten Enzymes Required for the Biosynthesis of IMP

Multiple Choice

Four of the ten enzymes required for the biosynthesis of IMP are listed below.In which order do the reactions these enzymes catalyze occur during the synthesis of IMP?
1.IMP cyclohydrolase
2.GAR synthase
3.glutamine-PRPP amidotransferase
4.AIR carboxylase

A) 1 → 2 → 3 → 4
B) 4 → 3 → 2 → 1
C) 3 → 2 → 4 → 1
D) 2 → 3 → 4 → 1