Why a gene for the production of a human hormone would be placed in bacterial dna

I think that the question refers to the artificial placement of such human gene by medical engineers.

The reason why they would do this is that this is a way of introducing this hormone into a human body: it's easy to introduce bacteria into a human body and such a hormone could be inserted through the bacteria.

Another reason is that this bacteria could produce his hormone and then this can be harvested to use in medicine.

The correct answer is c