Answer: C
Explanation: Imagery in writing is visual symbolism, or figurative language that evokes a mental image or other kinds of sense impressions. in other words, the words should let you envision what is happening. when the writer says “he came back at a sharp trot”, they included “sharp” to add imagery to the writing to allow the reader to be able to see in their mind how the character was walking back “sharply” instead of just saying “he walked back”.