"A research team synthesizes a novel organic compound 'X' with the molecular formula C5H8O2. When 'X' is treated with a deuterated acid (D2O), a single deuterium atom replaces a hydrogen atom, forming compound 'Y' (C5H7DO2). 'X' does not react with 2,4-Dinitrophenylhydrazine (2,4-DNP) but does react with both Tollens' reagent and Benedict's solution, forming a silver mirror and a red precipitate, respectively. Furthermore, 'X' undergoes catalytic hydrogenation over a palladium catalyst, consuming one mole of hydrogen to form a compound 'Z' (C5H10O2). Based on these observations, what is the most likely structure of compound 'X'?" A. Methyl vinyl ketone B. 3-Buten-2-one C. Acetoacetic ester D. 2-Hydroxypent-3-enal