An author presents a variety of details(like facts, logic, or evidence) into their work to back their ideas and claims which are being proposed in order to establish credibility and convince the audience to accept and believe in those ideas.
As per the question, the detail that best encourages/supports the idea would be 'teachers would be admired and well paid' as it accomplishes the authors' idea in portraying the image of the esteemed situation of teachers or educators in a perfect society and convinces the readers to connect to the idea. Thus, option C would be the correct answer. Teachers would be admired.
