Answer:
A. The door slammed shut because the wind will be blowing.
Explanation:
The correct way to say that would be <em>The door slammed shut because the wind was blowing</em>
Binsey Poplars is full of unusual language, internal rhyme, alliteration, assonance, sprung rhythm and repetition. Hopkins developed his own unique sprung rhythm, based on a much older metric tradition with roots in Greek song and Welsh poetry.