The answer is c. courtroom : lawyer.
The original analogy, football field : head coach, is comparing a workplace to a profession that would work in that workplace. A, B, and D don't fit that description (A is comparing two similar professions, B is comparing a job with a task that person would do, and D is comparing two people) so C is your best option (it, too, follows the format of workplace : profession.)
Hope this helps!
Answer:
The answer is D, "The source of the Mississippi River is a peaceful lake in Minnesota; from there, the river flows south past 10 states to its mouth in Louisiana, where it empties into the Gulf of Mexico."
The adjective would be French because it describes the baguette