Answer:
Part A. Making a good impression is difficult sometimes.
Part B. Thereupon Anne held her tongue so obediently and thoroughly that her continued silence made Marilla rather nervous, as if in the presence of something not exactly natural.
Step-by-step explanation:
K12 test correct answer.
For part A I chose D and got it wrong. Also, for part B I chose the answer starting with "this made Marilla more nervous than ever" which was also wrong.