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Which reactive intermediate is formed during the condensation reaction between acetaldehyde and formaldehyde ?

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Which reactive intermediate is formed during the condensation reaction between acetaldehyde and formaldehyde ?
A. `:overset(-)CH_(2)CHO`
B. `overset(+)CH_(2)CHO`
C. `overset(+)CH_(2)OH`
D. `:overset(-)CH_(3)CHO`.
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In crossed aldol condensation between formaldehyde and acetaldehyde, `alpha`-hydrogen atoms of acetaldeyde, due to `-E` effect of `gtC=O` group is slightly acidic in nature. In the first step `OH^(-)` ion (from the base added) abstracts one of these acidic `alpha`-hydrogens to form carbanion or enolate ion which is stabilised by resonance.
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