* usage of 'one of the factors'

[vittalk_usa]

Hi Ron, Stacey,
I want to know whether it is keep or keeps in the following sentence?
Also, in general pls tell me how should one handle a sentence with "one of the factors" or more generally a phrase of the form "one of Xs"

A higher interest rate is only one of the factors, albeit an important one, that keeps the housing market from spiraling out of control, like it did earlier in the decade.
A) that keeps the housing market from spiraling out of control, like it did earlier in the decade.
B) that keep the housing market from spiraling out of control, as it did earlier in the decade
C) that keeps the housing market from spiraling out of control, as it did earlier in the decade
D) that keep the housing market from spiraling out of control, like earlier in the decade
E) that keep the housing market from spiraling out of control, like it did earlier in the decade

Thanks

[Ben Ku]

Please cite the source (author) of this problem. We cannot reply unless a source is cited (and, if no source is cited, we will have to delete the post!). Thanks.