For the synthesis of sugar by reducing CO₂, NADPH₂ provides:

Explanation

NADPH is vital in the Calvin cycle, where it acts both as a coenzyme and a provider of energized electrons. These electrons are used to reduce carbon dioxide into glucose. Option D, 'Both B and C,' captures the dual function of NADPH, making it the correct answer. Option A is incorrect because enzymes are not supplied by NADPH. Option B mentions the coenzyme role but misses the primary function of donating electrons. Option C correctly identifies the provision of energized electrons but does not acknowledge the coenzyme aspect, which is why Option D is the most comprehensive choice.