Answer won't be "C" since there is conjugation.
Yes you are correct. I think c should also be one of the correct answers. I don't know why only a has been given as the correct option.
Pi bond between two N atoms will take part in conjugation with the benzene ring.
Ans C is correct
C can't be correct..bcz N triple bond N has one sigma bond and two p orbital involved....it has one free P orbital which can accept electron from ring ...(This is my guess)