It's purpose is to break down a work into it it's minor pieces say like imagery and scenery and givean explanation on the form of the work
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:
none
Explanation: there is none