Which of the following statements could the researcher best provide as a rationale for her work?

A researcher is involved in the production of insulin through recombinant DNA technology. Which of the following statements could the researcher best provide as a rationale for her work?
The gene fragment responsible for insulin production can be isolated and reproduced.
Particular bacteria are capable of insulin production.
It is possible to reproduce the chromosome responsible for insulin production.
Recombination of DNA base pairs can result in a gene that will produce insulin.