Christina Rossetti's decision to have a robin, a bush, the moon, and the ocean speak in "A Wintry Sonnet" is an example of what?

Symbolism

Explanation:

This is an artistic and poetic movement or style using an indirect suggestion to express mystical ideas, emotions, and states of mind. It is a mark, sign or word that indicates, signifies, or is understood as representing an idea, object, or relationship. Symbols allow people to go beyond what is known or seen by creating linkages between otherwise very different concepts and experiences. It is a way of bringing up an object representing another, to give an entirely different meaning that is much deeper and more significant.