whAt hAppEnED to thE numBEr oF pEoplE worlDwiDE living in ExtrEmE povErty ovEr thE pAst 20 yEArs
A．thE numBEr hAs FAllEn to 19%.
B．thE numBEr hAs FAllEn to 20%.
C．thE numBEr hAs FAllEn By 19%.
D．thE numBEr hAs FAllEn By 20%.