The same thing happened to me- consistently scoring around 168 and then dropped to161-162 two weeks ago. I took two days completely off studying and the next score I got was a 169, and then broke into the 170s this week. Mental burnout is real! Breaks help, even if it feels like you're wasting time.

#help

I feel the same way, paragraph 3 seems to explicitly support answer D, by saying there's no way to disprove their claims.