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Resonance structures of propenal are giv...

Resonance structures of propenal are given below. Which of these resonating structures is more stable ? Give reason for your answer.
`CH_(2)=underset("I")(CH-CH)=O harr underset("II")(overset(o+)(CH)_(2)-CH=CH-overset(Theta)(O))`

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`underset((A))(CH_2 = CH - CH = O) harr underset((B))( overset(+) CH_2 - CH = CH - overset(-)O)`
A is more stable than B.
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