Which adds evidence to the idea that the cell is the basic unit of life?
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a. it is impossible for a multicellular organism to survive.
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b. small organisms are generated spontaneously.
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c. each cell contains ribosomes and has a cell membrane.
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d. many organisms in the world are made of only one cell.

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).

you're crazy : )