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From the question's equation itself.
Replace R` with H.. since it's a Aldehyde.
R can be any alkyl group (CH3,C2H5)
So only possible answers are C and D.. as they are the only ones which contain the bonds Which I have shown in the above pic.
But D will be a product from a ketone as there are 2 R groups, 1 OH and 1 COO- Group attached to it! while we need only 1 R group for a aldehyde.. so answer is C.
still confused between C & D