Which of the following is aromatic compound? (a) (b) (c) (d)

According to Huckel's rule, Option (b) is the correct answer as there are 6 electrons following (4n + 2) rule and the electrons and double bonds are in resonance with each other. Cyclic resonance is absent in option (a) and (c) and (4n+2) rule is not followed in option (d)