41. The reaction, 1,3-bisphosphoglycerate→ 2,3-bisphosphoglycerate, is catalyzed by:
(A) bisphosphoglycerate phosphatase
(B) bisphosphoglycerate mutase
(C) 2,3-bisphosphoglycerate synthetases
(D) 3-phosphoglycerate isomerase
(E) 1,3-bisphosphoglycerate hydrolase