B is not correct because the political advisor's reasons are not advancing free speech "for its own sake". Their argument is based on the positive benefits of free speech. The argument would have to be totally different if it was advocating free spe…
The wording of this answer is tricky. I interpreted the correct answer in two ways:
When the director "could not properly infer", the idea did not occur to him, and thus he did not make the inference. This reminds me of like a logic game: oh, i go…