The relevant information is: "I Wandered Lonely as a Cloud" (also commonly known as "Daffodils") is a lyric poem by William Wordsworth.
This justifies what answer for what question? Q & A:
Passage: "I Wandered Lonely as a Cloud" (also commonly known as "Daffodils") is a lyric poem by William Wordsworth. It is Wordsworth's most famous work.

Question: Based on this passage, who wrote the poem a host of golden daffodils?
William Wordsworth