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 on O₂ exchange in the lungs by replacing part of the nitrogen with helium so that the inspired air consists of 60 percent N, 19 percent He, and 21 percent O₂