Final answer:
Photosystem I is responsible for boosting electrons to a high energy level to create NADPH from NADP+ in the process of noncyclic photophosphorylation during photosynthesis.
Step-by-step explanation:
The photosystem that is able to boost electrons to the very high energy level needed to make NADPH from NADP+ is Photosystem I (B). In the light-dependent reactions of photosynthesis, energy from sunlight first hits Photosystem II, where water is split to release electrons. These electrons are passed through an electron transport chain to Photosystem I. When photons strike Photosystem I, the electrons get re-energized and this energy is then used to reduce NADP+ to NADPH, an energy carrier that, along with ATP, is later used in the Calvin cycle to produce glucose. The pathway of electrons and the generation of NADPH and ATP in chloroplasts is known as noncyclic photophosphorylation and follows the Z-scheme.