Genetic modification — practice question

The stages show how genetic modification can be used to make human insulin using bacteria. Which order of stages will result in bacteria producing human insulin?

• A2 → 1 → 4 → 3 → 5
• B2 → 5 → 1 → 3 → 4
• C4 → 2 → 3 → 1 → 5
• D4 → 3 → 5 → 1 → 2