What type of dna is easiest to collect?
nuclear dna
mitochondrial dna
cellular dna
individualistic dna

The correct answer is mitochondrial DNA.

The mitochondrial DNA is easiest to collect among all the given types of DNA. In a cell, there are multiple mitochondria, all the mitochondria have their own circular DNA. As the mitochondria are present in multiple number, there are greater chances for the collection. Also, it can be easily obtained by separating mitochondria from the cell. So, it can be obtain in a sufficient amount from a small amount of sample.

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explanation:

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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).