Which of the following molecules is reduced by accepting hydrogen in the Calvin cycle?

Explanation

The molecule that is reduced by accepting hydrogen in the Calvin cycle is 1,3-bisphosphoglycerate. This reduction step, driven by NADPH, converts 1,3-bisphosphoglycerate into glyceraldehyde-3-phosphate, representing the key phase where energy and reducing power from light reactions are used to form carbohydrate precursors.