Mutarotation involves:
A) Racemization
B) Distereomerisation
C) Optical resolution
D) Conformational inversion

Hint:To answer the question properly we need to know what is mutarotation and its origin. Mutarotation property was first seen in sugar. The particular pivot of sugar in watery arrangement shifts from sugar to sugar. Mutarotation is basically a chemical phenomenon used mainly for carbohydrates.


Complete answer:
Mutarotation is the adjustment in the optical turn due to the adjustment in the balance between two anomers when the comparing stereo centers interconvert. Cyclic sugars show mutarotation as \[\alpha \] and \[\beta \] anomeric structures interconvert. The optical revolution of the arrangement relies upon the optical turn of each anomer and their proportion in the arrangement.
Mutarotation was found by French scientist Dubrunfaut in 1844 when he saw that the particular revolution of watery sugar solution changes with time.
The reaction mechanism for the interconversion of \[\alpha \]and \[\beta \]anomers is shown below:


The expression "mutarotation" begins from the noticed change in the optical pivot of the \[\alpha \] and \[\beta \] anomers of glucose upon disintegration in water. Because of ring-chain tautomerism, the \[\alpha \] and \[\beta \]frames gradually interconvert until the equilibrium is set up.
For understanding the process we must know about the isomers.
Mainly there are two types of stereoisomers. One is enantiomer another one is diastereoisomer.
Enantiomer is a non-super-imposable mirror image and diastereomer is neither superimposable non mirror image.
-Mutarotation is the adjustment in the optical pivot due to the adjustment in the balance between two anomers when comparing stereo centers interconvert.

So,The correct option is (B); mutarotation involves diastereomer ization.


Note:Mutarotation is a distinction in the particular pivot of plane-enraptured light, because of the adjustment in the balance between two anomers in the arrangement. Any atom to show mutarotation should have a hemiketal or hemiacetal gathering.