OM Step 2-Ask questions
The actual question (with a question mark) will not be found. However, by reading you can likely deduce
the question(s) the authors are asking,
2. What is the question these scientists were asking?

answer; ///i do believe the answer is (virus);

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).