Answer:
A That sends the frozen-ground-swell under it,
B To please the yelping dogs.
Step-by-step explanation:
Imagery is a vivid and descriptive language that evoke in us pictures or ideas that appeal to our sense of sight, hearing, smell, taste or touch. Sentence A contains imagery because it is descriptive enough to appeal to our senses of sight and touch, and sentence B also contains imagery because the phrase "yelping dogs" appeals to our hearing sense.