Answer: C) "Can I see a falling tear, / And not feel my sorrows share?"
Explanation: From the given options, the one that best supports the theme of people being compassionate when they see others who are sorrowful, developed in the poem "On Another’s Sorrow" is the corresponding to option C: Can I see a falling tear, / And not feel my sorrows share? because it expresses the sentiment of compassion and empathy the speaker feels when he sees another person crying.