请教点动词用法～nn们～～

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28. (25890-!-item-!-188;#058&002817)

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) declaring themselves bankrupt has jumped by almost 20 percent, at

(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
选b 其他的点我都明白，就是想不透为什么declaring可以加ing？不是点动词么？？
谢谢～～～～

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没人理呀～

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嘻嘻 请教