The symbolism that the willow tree makes in the given line would be
b). Youth
Symbolism is described as the device through which the author attaches a deeper and significant meaning to an object or individual.
In the given excerpt, the willow tree acts as the symbol to denote 'youth."
This is substantiated through the details like "young green willow shimmering...edges" which shows that the tree sings the song of youth.
Thus, option b is the correct answer.
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