Which situation would most likely increase the carrying capacity for humans in a certain region

Better soil

Of the following given choices;

A. A higher fertility rate

B. Less access to medicine

C. A new source of fresh water

D. A higher birthrate

The answer is; C

Carrying capacity is the maximum population size than habitat or environment can sustain indefinitely because it is able to replenish its resources. Limiting factors to carrying capacity of an ecosystem include resources such as food, water, and space.