If a skin cell takes 3 hours to divide, how many skin cells will there be after 15 hours?

your answer would be a, maximum exploitation of resources.

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).

true if u need with any other question i can you with them