Definently A because you can rule all the others out if you look at map
In this example, the biosphere is very dependent on the hydrosphere.
Answer:
A categorical grant is used for a specific purpose, or category, for state or local spending. (Ex: natural disaster, airport building, crime fighting) that depends on state's population. Block Grants are given for general purposes that the states can use as they see fit (welfare, public health).
