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From what I've leaned, none of them are quanitative, as the answers would not be quantitative. Roughly, none can be answered with a number. If any of them are, I think it would be C because the answer is factual. Like, it could be a simple yes or no. Also maybe.. Perhaps the most compelling reason for me to choose C is that you can put it on a scale that discusses the magnitude of like or dislike. You don't have this ability with A (can't answer "why" on a scale so well) or B (can't discuss many thoughts with a scale).
What I would consider qualitative is "How many sandwiches have you eaten with mustard?" or "What is the frequency with which you eat sandwiches with mustard?".
My view is from what I've learned in statistics, however. I hope this has helped! Hopefully you get some more insight from other people soon!