Which of these is a correct order of taxonomic catagories from less to more specific?

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

i think that d. wind is the answer.   i missed the question when i answered a. currents.