The correct answer is - autumn equinox.
Since Jake and Adriane live in different Hemispheres, the seasons will be reversed, so if in the Northern Hemisphere is spring, than in the Southern Hemisphere will be the opposite, autumn, and vice versa.
If at the place where Jake lives in March 20, thus the spring equinox, in the place in which Adrian lives it is the same date, March 20, but it is the autumn equinox.
