38. Which of the following reactions is catalyzed by a transketolase in the pentose phosphate pathway? I. fructose-6-P + glyceraldehyde-3-P → xylulose-5-P + erythrose-4-P II. erythrose-4-P + fructose-6-P → sedoheptulose-7-P + glyceraldehyde-3-P III. sedoheptulose-7-P + glyceraldehyde-3-P → ribose-5-P + xylulose-5-P (A) I only. (B) II and III. (C) II only. (D) I and III. (E) I and II.