Marcus' tone is A, concerned. He is talking about a serious topic, so it doesn't make any sense that he would be amused by it. There are no sentences in the text stating that he would be indifferent or pathetic either. Hope I helped, could I get brainliest? :)
I'm putting this so you can give Brainliest to the other guy! I am also taking the test and I put that as my answer!