This change best illustrates the 3rd answer choice, Loss of Habitat.
The plants aren't migrating, but are rather only surviving in areas where there is enough moisture to support life. The wildflowers are not adapting to grow in dryer conditions, and the species is not going extinct, as there are still some areas where the plants can get enough moisture.
Hope this helped!
Since people with HIV have weakened immune systems it would be:
C) People with HIV are unable to fight off these rare diseases.
Because there is oxygen being used, the body can create 32 ATP instead of 2 ATP like in fermentation