AC B is wrong because David never states or implies that the only role is teaching. If you think that his statement regarding not wanting to pay teachers for paid time off implies that, that's an added assumption that you as the reader are making. I also somewhat struggled with AC B but that was my thought process.

I suggest you take a PT as soon as you can to see how you've improved. If it's only a few points from your target goal, then you can just try to practice until the actual August exam and maybe you'll hit your target. If you're ~10 points short or more, I'd recommend registering pushing your test back but also taking a lot of PTs and timed sections in the mean time. The CC only goes so far if you're not reinforcing the material with actual exams.