The Oxygen, O₂, and Hydrogen Sulfide, H₂S, Molecules Are About

The oxygen, O₂, and hydrogen sulfide, H₂S, molecules are about the same size and they also have about the same degree of polarity. This helps to explain why

A) the body survives when breathing H₂S just about as well as it does when breathing O₂.
B) H₂S is such a smelly compound while O₂ has no smell.
C) the Earth's ancient atmosphere was once abundant with H₂S.
D) cells absorb H₂S just as easily as they absorb O₂.