How to find the product here.Please help.

is it b?

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.