A Human Cell Has a Mutation in the Gene That

A human cell has a mutation in the gene that encodes the enzyme that generates lactate from pyruvate, rendering that enzyme completely non-functional. Assuming that there is ample glucose present, how would this cell generate energy in the presence of oxygen?

A) This cell would have no way to generate energy under these conditions because it cannot carry out the reactions needed for glycolysis.
B) Aerobic respiration.
C) Primarily through the break down of proteins into amino acids.
D) Glycolysis coupled with ethanol fermentation.