Complete the following reaction

Explanation

Case `I:` If the electromeric effect takes place at `C-2` and `C-3` and `H^(o+)` adds on `C-3` . The double bonds are not in conjugated but in isolated position.

Case `II:` If the electromeric effect takes place between `C-6` and `C-7` and `H^(o+)` adds on `C-7`

A four `-` membered ring with double bond is a highly strained ring is unstable, therefore `(C )` is not formed
Compound `(B)` is formed, since six `-` membered ring is more stable and is also formed from more stable `3^(@)` carbocation `(II)`.