Answer:
D. Can I see a falling tear, / And not feel my sorrows share?"
Explanation:
"On Another's Sorrow" is a poem by William Blake.
First three stanzas are composed of set of questions dealing with compassion and ability to empathize with others. Questions can be summed up to one: "How can one not share another's sadness and sorrow?".
So, when the author says "falling tear" he obviously refers to someone crying and expresses the human need to comfort that person, share the sorrow with him, make him feel better.