In which of the following, will resonance be possible?

In which of the following resonance will be possible?

In which of the following resonance will be possible? (A) CH_(3)-CH_(2)-CH_(2)-CHO (B) CH_(2)=CH-CH=O (C) CH_(3)COCH_(3) (D) CH_(2)=CH-CH_(2)-CH=CH_(2)

In which of the following, resonance is not possible?

In which of the following species resonance is possible?

In which of the following resonance is not possible ?

In which of the following, resonance is possible

Which of the following exhibits resonance?