Answer:
D) instrument inference.
Explanation:
An inference is when you can understand something without the aid of a text. In this way, an instrument inference is when you use some tools and clues to find what you're looking for. In this case, Chaz realizes that his grandma was listening to the radio because of the way she spoke about. The feeling of eternity created by the song was because in one moment it would end, so they enjoyed as they could, creating the idea of stay there for a long time. A sensation that a CD can't provide.