A. Upon introduction of the aspartate into the Krebs cycle, label will first appear inoxaloacetate.B. Upon introduction of the alanine into the Krebs cycle, label will first appear incitrate.C. Labelled alanine will yield 14-CO2 during the first turn of the cycle.D. Labelled glutamate will yield 14-CO2 in the second turn of the cycle.