Answer and Explanation:
Twain avoided "literary offenses" by not mentioning these works throughout the narrative. This was significant because Twain keeps his attention on the narrative itself, specifically stimulating the themes that the narrative addresses.
In this case, instead of provoking criticism to other known works and authors, Twain highlights a narrative with themes that provoke reflections on regional differences and stereotypes, a sense of community and personal integrity.
It's b) as extremely might be a infinitive phrase
Your answer will be I
Because Frankie is coming over to watch a movie with Sadie and me. Just doesn't work. However, Frankie is coming over to watch a movie with Sadie and I. Does work because you're talking about yourself and you're talking about another person.
So that's your answer.
I hope it helped! :)