新prep180，关于主语的问题

davidleezone

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
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
不是说 不定式短语或者-ing分词作主语，谓语动词用单数么。  这样的话就AB的make都不对啊。
看之前的讨论 什么中心词，不太懂~ 求助！！

edwardelric

rates 这个是主语 rising 增长的

davidleezone

哦···这样啊