The given flowchart shows the fate of carbohydrates during digestion in the human alimentary canal. Identify the enzymes acting at stages indicated as A,B,C and D and selct the correct option.
A. a-amylase,b- invertase ,c-maltase d- lactase
B. a-amylase.b-lactase,c-maltase,d-invertase
C. a-amylase,b-maltase ,c-lacrtase,d-invertase
D. a-amylase,b-maltse ,c-invertase,d-lactase