thAt Boys suFFEr morE From Air pollution CAn possiBly BE justiFiED By thE FACt thAt
A．thE mAlE hAvE lArgEr BonEs thAn thE FEmAlE.
B．womEn CAn mAnuFACturE BlooD morE EFFiCiEntly thAn mEn.
C．mEn usuAlly BrEAthE morE DEEply thAn womEn.
D．womEn BrEAthE As oFtEn As mEn.