Label the reaction as an oxidation or reduction, and give the reagent, NAD^{+} or NADH, that would be used to carry it out.
Analysis
Count the number of C—O bonds in the starting material and product. Oxidation increases the
number of C—O bonds and reduction decreases the number of C—O bonds. NAD^{+} is the coenzyme needed for an oxidation, and NADH is the coenzyme needed for a reduction.
