prep 1#180 宾语不长，有形式宾语代替就不好么

180.
            (26977-!-item-!-188;#058&002184)

Noting that the Federal Reserve had raised a key short-term interest rate again last month, analysts said that they expected orders for durable goods to decline soon because rising interest rates makes it more expensive to buy them on credit

A. rising interest rates makes it more expensive to buy them on credit

B. rising interest rates make buying on credit more expensive

C. a rise in interest rates make it more expensive to buy on credit（主谓不一致）

D. a rise in interest rates make buying on credit more expensive

E. a rise in interest rates makes it more expensive for them to be bought on credit(罗嗦)

答案是B，我选的是A，不太明白一下2点，请牛牛解答：

1 ）如果就rising interest rates和 a rise in interest rates而言：选择rising interest rates 是因为a rise in interest rates 复杂么？还有别的原因么？

2 ）A为什么不对呢？是因为多了个them没有B简洁么？还有别的原因么？