Answer:
B). It develops the idea that the speaker believes that misery is easily overcome with music.
Step-by-step explanation:
Imagery is demonstrated as the literary device in which the author provides vivid descriptions or images of sensible objects using a descriptive language. This helps in allowing the readers to visualize the description and appeal to their senses and evoke the desired response.
In the given lines, the author primarily discusses that music bears the ability to soothe and renew the human spirit. Thus, the author employs imagery while describing 'sang a lay...In a strain to soothe his bleeding heart' to 'develop the idea that the speaker feels music has the power to conquer the miseries easily.' This helps the readers to visualize the power of music and associate themselves with it sensibly. Thus, option B is the correct answer.