It is antiaromatic and on losing a proton the nitrogen will have no positive charge left on it making it more stable. So it can easily donate proton in comparison to any other compound of other options.
Compound c &d are already aromatic..so after losing proton they will not get any extra stability,but compound b is antiaromatic so after losing proton it will get stability as it becomes aromatic..on the other hand compound a also don't get any stability after losing proton like compound b..thus compound b is most acidic
Initially 'B' is antiaromatic due to absence of lone pair on N. On loosing the 'proton', the N takes up the bonding electrons and thus the conjugate base becomes more stable due to gaining of aromaticity by becoming a 6 pi electron system.
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