请教Prep一题(语法笔记中无)

In 1997, despite an economy that marked its sixth full year of uninterrupted expansion with the lowest jobless rate in a quarter century, the number of United States citizens declaring themselves bankrupt has jumped by almost 20 percent, at 1.34 million.

A. ......
B. declaring themselves bankrupt jumped by almost 20 percent,to
C. who declared themselves bankrupt has jumped by almost 20 percent,to
D. who declared themselves bankrupt jumped almost by 20 percent,at
E. to declare themselves bankrupt jumped almost by 20 percent,at

正确答案是B.

看完该题后我将答案锁定在B和D之间.
相比之下,我认为D中的定语从句比B中的declaring好,但D中的at感觉怪怪的.
猜想:"可能to表示减少到,而at表示减少了". 于是尽量不改变原句意思,选了D.

想问一下,如果要表示减少了1.34million,那么该介词应该用什么?还是干脆不用介词?

jumpt by 20 percent, almost修饰应该加在by之前，于是排除DE。

说明的是破产率，所以declared不对，排除CDE

比较AB，to表示变成了1.34,而不是在1.34跳，排除A.