An Important Part of the History of Our Understanding of the Atmospheric

An important part of the history of our understanding of the atmospheric ozone layer was

A) the discovery by Rowland and Molina of a large ozone depletion over Antarctica.
B) the discovery by Susan Solomon of a large ozone depletion over Antarctica.
C) the discovery by Susan Solomon that jet airplane exhaust is contributing to the greenhouse effect.
D) the discovery by Rowland and Molina that jet airplane exhaust is contributing to the greenhouse effect.
E) satellite measurements that showed a dangerous build- up of ozone all over Earth.