How to find the product here.Please help.

Eliminations usually prefer anti conformation of leaving group and beta hydrogen. This is ester pyrolysis, it is similar to cope elimination and is a SYN elimination. Pyrolytic eliminations are always cope/syn eliminations.

Occurs readily due to five or six membered transition state.
Carboxylic acid is a side product.

Thank u very much.Ur answer A) is correct.Thnks for elaborating me the process.