Coexist means that they live together or they are used together. Therefore, they coexist with one another. The answer would be C.
I hope this helps!
Volume is how loud they speak, and tone is how they sound while speaking, like how their voice represents the feeling. Like in a persuasive speech about animal abuse, Volume could be loud or soft, and the tone could be angry or sad.
C is the correct answer because Kareem thought that Mrs.McMudge was mean at first and hated she yells but after hearing from Jenny that she yells due to her bad hearing, he starts to understands her and know her personally and liked her.