A.	Low pH increases the concentration of base causing mitochondria to pump out H+ to the inter membrane space leading to ATP production.
B.	The high external acid concentration causes an increase in H+ in the inter membrane space leading to increased ATP production by ATP synthetase. Mitochondrial production of ATP requires a concentration gradient of H+ with a high concentration at the inter membrane space and a low concentration in the matrix. The inner membrane is impermeable to H+, but the outer membrane of the mitochondria will allow H+ to pass through. Thus, placing mitochondria in a low pH buffer produces a H+ gradient that can generate ATP through ATP synthetase.
C.	Low pH increases the acid concentration in the mitochondrial matrix, a condition that normally causes ATP production.
D.	Low pH increases the OH- concentration in the matrix resulting in ATP production by ATP synthetase.