Ahidden virus a. cannot attach to a host cell. b. becomes part of the host cells genetic material. c. immediately takes over the cell's functions. d. attaches to but does not enter the cell.

what in the weirdo : o

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).