Carbon monoxide is A) caused by ozone depletion
B) the same as carbon dioxide
C) extremely damaging to human blood
A
D) produced by plants during photosynthesis
O E) consumed by plants for photosynthesis

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).