I think it’s D. Knowledgeable
D. friendly and respectful because it is a friendly letter, you don't want to be sarcastic which could come off as rude, and you don't want it to be formal either
Answer:
The central idea of the book is, aspects of good citizens
Adverbs are words that are used to modify or qualify the verb, adjective and sometimes another adverb. From the sentence above and from the choices given, the word that is not an adverb is the word because. Thus, the answer is letter D.
