"Impurity" as it is used in the passage most likely means that the tones were flawed, as is expressed in option B and further explained below.
To better understand this answer, we must understand the notion of connotation.
What is connotation?
Connotation refers to a secondary meaning of a word, that is, a meaning that is not the literal or original one. Here, we must analyze the connotation of "impurity", whose original meaning is something that is not pure, that is dirty or contaminated.
The word "impurity" is used to refer to tones in a context that mentions music. We can assume the connotation most likely refers to "flawed." If the musical standards are high in Detroit and the mouse's tones are impure, that means they are not good enough, they are flawed, imperfect.
With the information above in mind, we can select option B as the correct answer.
Learn more about connotation here:
https://brainly.com/question/26187178
