The rivers that feed a particular inland sea were diverted to irrigate a nearby desert so that the desert could be used to cultivate cotton. uncontrolled irrigation resulted in a drastic decrease in the size of the sea, and eventually the sea dried up completely. many aquatic populations were lost, and the land left behind was covered with salt.

which of the following solutions would best restore the ecosystem and prevent it from becoming a desert?
a.
direct sewage runoff water from local cities into the ecosystem to provide it with nutrient-rich water.
b.
reconstruct the irrigation system so that water from the river is allowed to enter the ecosystem.
c.
add synthetic fertilizer to the remaining soil in the ecosystem so that soil fertility increases.
d.
plant cotton crops in the ecosystem and grow the same crop for at least a decade.