For the first question regarding the idea emphasized in the second stanza of "Sympathy," the best answer is:
C. The bird’s suffering is ongoing.
In the second stanza, the mention of "a pain still throbs in the old, old scars" indicates that the bird is not just experiencing a one-time pain, but that its suffering is continuous and persistent.
For the second question, the line from the poem that best supports the answer to Part A is:
D. And a pain still throbs in the old, old scars.
This line illustrates the ongoing nature of the bird's suffering, reinforcing the idea that the bird is continuously in pain.