The line "I remember him!" provides the best evidence for the answer given in Part A because it shows the speaker's inability to forget.
The best evidence for the answer given in Part A is line 8, which says, "I remember him!"
This line directly supports the answer in Part A because it shows that the speaker still remembers the person they are trying to forget.
By saying "I remember him," the speaker acknowledges their inability to forget, which contradicts the idea that they can forget him.
This line strengthens the overall theme of the poem, which is the struggle to let go of a past love.