Match the Effects on the Rate of Gas Transfer, Labelled

Short Answer

Match the effects on the rate of gas transfer, labelled a. through c., with the changes listed. (Options may be used more than once or not at all.)
a.This change would increase the rate of gas transfer.
b.This change would decrease the rate of gas transfer.
c.This change would have no effect on the rate of gas transfer.
-the effect of a fall in atmospheric P_O2 on O₂ exchange within the lungs