Think of possible modifications for bacteria and yeasts that will make better and longer lasting kitchen products.

c

explanation:

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully

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).