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-maltase,C-lactase,D-invertase
B. A-amylase,B-maltase,C-invertase,D-lactase
C. A-amylase,B-invertase,C-maltase,D-lactase
D. A-amylase,B-lactase,C-maltase,D-invertase