How do the widths of the stomatal openings of plants 6-10 compare with those of the other plants after plant 6 was osmotically shocked?

The stomatal openings of plants 6-8 are smaller than those of the other plants; those of plants 9 and 10 are intermediate in size. 
-->Plants 6-8 are experiencing drought stress and have closed their stomata; plants 9 and 10 are starting to close their stomata. 

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.