The Great Lakes region is a major source of fresh water and home to a diverse group of plants and animals. Which of these factors could disturb the stability of the ecosystem?
A) A decrease in fishing throughout the Great Lakes region.
B) A slowdown of clear cutting and construction in the area.
C) Normal snowfall in winter, ensuring that water levels remain normal.
Eliminate
D) The disappearance of a keystone species due to an increase in water temperature.

not sure if this is what you'r looking for nnew= nold

i need

the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).