[Nitin_Naudiyal]

Please help me with this problem.

[JustinCh3m]

the first structure is BY FAR the best structure because the benzene ring has 6 pi electrons (4n +2) - special stability of being aromatic.  The other resonance structures are neither aromatic not antiaromatic (4n) because there are now 7 pi electrons in the cyclic, conjugated array of p-orbitals.  It's just an "ordinary compound" - not aromatic, not antiaromatic.

[Dan]

Here is a better picture, which might make things clearer:

[juanrga]

Please help me with this problem.

I would add that a resonance is a representation of what is happening. The molecule is not in one of those forms and then jumps to another. You cannot say that the "bond shift". The molecule is in a quantum mixture of all the resonant forms.