In the following reactions,products $A$ and $B$ are

• A
  $A = \text{3-hydroxy-6,6-dimethylcyclohexanone}; B = \text{6,6-dimethylcyclohex-2-enone}$
• B
  $A = \text{3-hydroxy-2,2-dimethylcyclohexanone}; B = \text{6,6-dimethylcyclohex-2-enone}$
• C
  $A = \text{2-hydroxy-2,3-dimethylcyclobutanecarbaldehyde}; B = \text{2,3-dimethylcyclobut-2-enecarbaldehyde}$
• D
  $A = \text{2-hydroxy-2,3-dimethylcyclobutanecarbaldehyde}; B = \text{2-methylene-3,3-dimethylcyclobutanecarbaldehyde}$