Which of These Reactions Is Catalyzed by a Transketolase in the Pentose

Which of these reactions is catalyzed by a transketolase in the pentose phosphate pathway?

A) erythrose-4-P + fructose-6-P ↔sedoheptulose-7-P + glyceraldehyde-3-P
B) sedoheptulose-7-P + glyceraldehyde-3-P ↔ erythrose-4-P + fructose-6-P
C) fructose-6-P + glyceraldehyde-3-P ↔ xylulose-5-P + erythrose-4-P
D) glucose-6-P +2 NADP+ + H₂0 ↔ ribose-5-P +2 NADPH +2 H⁺