B) Desolate
Desolate is deserted of people and in a state of bleak and dismal emptiness.
Example: There was a desolate wasteland besides for the grazing sheep.
Here is a website that will help you find the answer and understand the poem as well...
http://www.sparknotes.com/poetry/hopkins/section4.rhtml
If you do not wish to visit the site I believe the answer is A.
Because she is mourning her own mortality, because man is mortal.
Answer:
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