The following is a scheme showing the fate of carbohydrates during digestion in the human alimentary canal. Identify the enzymes acting at stages indicated as A, B, C and D. Choose the correct option from those given.
(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