The correct option is
B ![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1358430/original_28-9-21_16.png)
Oxime in presence of reagent like
H2SO4, P2O5, PCl5, SOCl2 undergo Beckmann rearrangement to form N-Substituted amide.
Beckmann rearrangement mechanism:
Step 1: Protonation
Here, the
OH in oxime group is protanated and it removed as
H2O molecule.
Step 2: Intramolecular rearrangement
Here, the group which intially present opposite to the
OH group will migrating to form resonating structures.
Step 3: Hydrolysis
The water molecule will attack the resonating structure and hydrolysis it and undergo tautomerism to form N-substituted amide.
In given reaction, methyl group is present opposite to
OH so it migrates to gives product (b).
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1358430/original_28-9-21_16.png)