An investor puts a total of 8,000 into two accounts, one earning 4% annual interest and the other earning 7% annual interest. After one…

Let $x$ be the amount at 4% and $8000 - x$ the amount at 7%. The interest equation is $0.04x + 0.07(8000 - x) = 470$, which simplifies to $560 - 0.03x = 470$, so $0.03x = 90$ and $x = 3000$. Then the 7% account holds $5000$. The difference is $5000 - 3000 = 2000$, choice A. Check: interest is $120 + 350 = 470$. Choice B (5000) is the amount in the 7% account, not the difference. Choice C (3000) is the amount in the 4% account. Choice D (1000) has no support. The question asks for how much more, which is a difference.