The most possible answer is either D or A.
In both cases, it's quite sure that these words "grieving, sigh, blight" all represent a more sorrow deviation or a more deepened mood. The best answer of the two would probably depend on how you view the poem, either as one with a hopeful mood or one with a sorrowful mood.
Answer: “This” should refer to the leg specifically designed for rock climbing
Explanation: Lmk if u have any questions!
