Scientists base many of their investigations on questions that test accepted theories. Which outcome of an investigation would cause a scientist to ask a different question? A) The observed results are different from the expected results B) The investigation had many sources of error. C) Another scientist proposed the same theory.
D) The expected results could be explained in different ways.​

A scientist would ask a different question when he or she founds that the observed results are different from the expected results.

Explanation:

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

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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).