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:overset(-)CH(2)-underset( :O: )overset(...

`:overset(-)CH_(2)-underset( :O: )overset(C)(||)-CH_(3) and CH_(2)=underset(( .^(-): O: ))underset(|)C-CH_(3)`

A

resonance structure

B

tautomers

C

geometrical isomers

D

optical isomers

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Verified by Experts

The correct Answer is:
A
They are resonance structures because they have identical skeletons but differ in the position of lone pair of electrons and `pi` bond:
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