“Burning book” who is the subject of the poem

The poem is targeted at the school, but in general, there is no subject

Explanation:

“Burning a Book” is a poem about taking risks—specifically, taking risks in writing. Stafford has always admired, and practiced in his own writing, the quixotic approach of plunging into the unknown. He maintains that no subject, as long as it involves the heart and intuition of the writer, is too small to write about.

true. the definition explains it: a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. this is a dictionary definition that i have looked up in a dictionary.