A tornado forms as a result of thunderstorms, so tornadoes would most likely be found in a location where- A.
winds blow constantly in the same direction.
B.
one air mass replaces another air mass.
C.
warm, moist air meets a cool, dry air mass.
D.
a mass of cold air remains for many days.

A

Explanation:

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).