What smaller than a multicellular organisms but larger than an organelle ?
4 examples

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

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).