Passage II
In August, the ozone (O3) content of the stratosphere above Antarctica begins to decrease, reaching a minimum around October 15. Over this period, winds surrounding this ozone hole keep it isolated from adjacent areas where the air has greater O3 content. In late October, the winds weaken, causing the O3 content of the air in the ozone hole to increase again as this air mixes with the air from adjacent areas. Figures 1 and 2 show how the air temperature and O3 partial pressure (a measure of O3 content), respectively, changed with altitude in a portion of the stratosphere above a location in Antarctica on September 15, October 15, and November 15, 2000.
Figures adapted from O. Troshichev and I. Gabis, "Effects of Solar UV Irradiation on Dynamics of Ozone Hole in Antarctica." ©️2005 by Elsevier, Ltd.
6. According to Figure 2, on October 15, 2000, the 
partial pressure was zero for all altitudes in which of the following ranges?
Your Answer is
Correct Answer is G
Explanation
Look at the short dotted line in figure 2, when the vertical coordinate altitude is 19-21 km, the horizontal coordinate is 0