A dictionary! That book is purely for definitions.
Answer: Commentary
Explanation:
Writing commentary means giving your opinion, interpretation, insight, analysis, explication, personal reaction, evaluation or reflection about a concrete detail in an essay. ... Writing commentary is higher level thinking. Commentary is what makes an essay interesting to read.
Dr. Lanyon has learned damaging new information about Dr. Jekyll. I know this because after Utterson asks if Lanyon has seen Dr Jekyll, his face changes and he says he never wants to see him again.
I think its A but it could be C
