【单选题】(The following is based on material written in 1996.) The Montreal Protocol on Substances that Deplete the Ozone Layer, signed in 1987 by more than150 nations, has attained its short-term goals: it ha...
A.
The levels of such chemcials in the atmosphere had decreased.
B.
The number of such chemcials that reached the atmosphere had declined.
C.
The amounts of such chemcials released had increased but the amounts that reached the atmosphere had decreased.
D.
The rate of increase in amounts of such chemicals reaching the atmosphere had decreased.
E.
The rate at which such chemicals were being reduced in the atmoshphere had slowed.