Aheterozygous pea plant that is tallwith yellow seed? ttyy is allowed to self-fertilize. what is the probability that an off spring will be eithertall with yellow seeds tall with green seeds, or dwarf with yellow seeds

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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).