1) I is more stable than II
2) I is less stable than II
3) III is more stable than II
4) II is less stable than III
How many statement(s) are corrects?

I) most stable, more number of covalent bonds, each carbon and oxygen atoms has an octet and no separation of opposite charge .
Ii) negative charge on more electronegative atom and positive charge on more electropositive atom.
Iii) does not contribute as oxygen has positive charge and carbon has negative charge,  hance least stable.