When One of the Eight Krebs Cycle Intermediates Is Added

Multiple Choice

When one of the eight Krebs cycle intermediates is added to the respiration medium of living cells,like yeast,what happens to the rates of ATP and carbon dioxide production?

A) There would be no change in ATP production but an increased rate of carbon dioxide production.
B) The rates of ATP production and carbon dioxide production both increase.
C) The rate of ATP production decreases,but the rate of carbon dioxide production increases.
D) Rates of ATP and carbon dioxide production both decrease.