In a set of reactions, acetic acid yielded a product D.
The structure of D would be :

The question seems to be asking for the product of a reaction involving acetic acid, but without specifying the reaction conditions or reagents, we can only speculate on the possible products based on common reactions of acetic acid. Acetic acid (CH3COOH) can undergo various reactions, such as esterification, acid chloride formation, or decarboxylation, depending on the conditions. Without the specific reaction details, it's challenging to determine the exact structure of product D. However, considering typical reactions of acetic acid, we might expect products that involve the modification of the carboxylic acid group or the addition of groups to the methyl group. The correct answer would depend on knowing the specific reaction or reagents used.