Answer: b. glycolysis.
Step-by-step explanation:
If a cell is starved for ATP, the TCA cycle would most likely be shut down. The TCA cycle, also known as the citric acid cycle or the Krebs cycle, is a process that occurs in the mitochondria of cells and generates ATP through the oxidation of glucose, fatty acids, and amino acids. However, the TCA cycle is not essential for the production of ATP under all circumstances. In particular, if a cell is low on ATP and needs to produce it quickly, it may rely more on glycolysis, which is a simpler and faster process that can generate ATP even in the absence of oxygen.
Therefore, the correct answer would be:
b. glycolysis.