GMATPrep 一道语法问题

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