Answer: D. The personification that the flowers "shuddered" creates a wistful tone.
Step-by-step explanation:
Figurative language refers to using words in a way that they are not normally used in order to paint a vivid picture. Personification is figurative language and it is present here with the use of the word, shuddered.
To shudder is a thing that humans do and flowers are incapable of such. Using it therefore is personification and it was used to create a wistful tone as the flowers probably long for warmer temperatures.