You asked this question before, and D is the answer. So I'm thinking you just need the explanation.
I searched up "Secondary Source" and this is what it says "a secondary source of information is one that was created later by someone who did not experience first-hand or participate in the events or conditions you're researching."
Think about it, A scientific lecture or A scientific paper and a journal article is not talking about events or first hand but magazine story is talking about events and if they missed up on what it was talking about. you can just get a magazine story, which makes it
