The correct answer is indeed C. When people are doing ordinary things, such as eating or walking. the poem talks about the indifference that most people feel towards the suffering of others, that could be taken place "While someone else is eating or opening a window or just walking dully along".
I already answered but... I can’t give a brief explanation my apologies!
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Answer: We need another Frenerick Banting in this world. We need someone as smart as him to find the cure for cancer and coronavirus. We need to unite as people and fund our scientists so we can decrease the death rate. 100,000 people a year die from cancer, and we are still just selling pink braclets? We should be funding thousands of dollars for scientists to work. If you are with me, do your part and help out.