Which has three times as many O atoms than N atoms?

The Answer is B because if we just look at the moles of nitrogen and oxygen they are in the ratio of 1:2. Since there are 3 moles with it, Even if we when we multiply this ratio by 3 the answer will be 3:6  and 6 is the double of 3 so B is the answer

HOPE IT HELPS!

i think the miocene epoch spans the time from 23 million to 12 million years ago.