The tropical grasslands are similar to the forest biomes in that both have * A. High temperature and heavy rainfall
B. Tall grasses and numerous trees
C. Long dry seasons and high humidity
D. Nutrient-poor soil and numerous grazers

It has high temperatures and low precipitation. the reason this would be corect is because, if very little preicipitation/rain/water doesn't happen then how are the tree suppsoed to get it nutrients or how are the leaves suposed to get its nutrients so it doesn't because rotten and fall of the branches.  Some areas that may not have much precipitation coming in, may most likely not have tress in the whole area or everywhere.

the answer to you question is   jet streams