During the acid-catalysed inversion of sucrose, the observed optical rotation of the solution changes from positive to negative because

Asucrose is converted into its mirror image
Bglucose is laevorotatory and fructose is dextrorotatory
Cthe acid catalyst is optically active
Dfructose is more strongly laevorotatory than glucose is dextrorotatory

Answer: D

Sucrose is dextrorotatory. It hydrolyses to equal amounts of D-glucose (dextro) and D-fructose (laevo). The specific rotation of fructose has the larger magnitude, so the mixture is laevorotatory and the sign of the rotation reverses.

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