Me asap : d will give brainliest and 5 you!

in an area with tall grass but with very few trees, which of the following other conditions are most likely to exist as well?
1 it is near 30° latitude north or south or on the leeward side of a mountain range. 2 moist air is rising over the area.
3 night temperatures are much colder than daytime temperatures.
4 the soil has a thick layer of decomposed, nutrient-rich organic material.
5 there is an extremely high diversity of species in the area.
6 there is little rainfall and frequent fires regularly cut the vegetation to the ground.

a 2 and 5
b 3 and 4
c 1 and 3
d 4 and 6