Answer:
He links melancholy and mirth by saying they both help people find their true nature and soul.
Explanation:
John Milton's "L'Allegro" and IL Pensoroso" are lyric poems in which the speaker asks melancholy and sadness to go away from his life and dwell at some other place. He calls the goddess of joy and asks her to bring happiness into his life. The poem reflects on the lives of the people and how melancholy and mirth helps them to attain the true meaning of life. The poet invites melancholy to dwell with him as he thinks that it carries peace, happiness, and contemplation with it.
It says it in the passage, it stays online forever, A. :)
A simile. Similes use like or as<span />
