A chloroplast has stopped producing ATP and NADPH. Which of the following is most likely causing this?

Krebs cycle

Explanation:

Krebs cycle is the second phase of cellular respiration, it occurs in the mitochondrial matrix and generates a pool of chemical energy (ATP, NADH, and FADH2) from the oxidation of pyruvate, the end product of glycolysis. Pyruvate is transported into the mitochondria and loses carbon dioxide to form acetyl-CoA, a 2-carbon molecule.