Just 2 steps forward.


Step 1 ‘Like it did’ is wrong. ‘Like’ can not be followed by a clause. So A D E are out. In addition ‘like earlier earlier’ and ‘like it did earlier earlier’ in D and E respectively are junk.

Step 2. B and C both use the pronoun ‘it’. Only ‘keeps’ can be the appropriate verb for that singular pronoun. Hence C wins.

Whatever way you look, you can not justify the plural verb ‘keep’, IMO, the OA is questionable.
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This question is the BANE of my existence.....it's B....no it's C....no it's B!

There are convincing arguments for both sides of B and C, despite the OA being B, I find it hard to believe that factors can be the subject.

Steve is one of the students who always DOES his homework?

OR

Steve is one of the students who always DO their homework?

The Vancouver Canucks is one of the hockey teams that IS playing for the Stanley cup this year?

OR

The Vancouver Canucks is one of the hockey teams that ARE playing for the Stanley Cup this year?

+1 B

S-V agreement.
Correct comparison.
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After reading a lot, I agree that B is correct. To know the subject we can ask "who keeps housing prices down?" - it is factors.

So factors is the subject. Interest rate is just one among many factors
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Notice two sentences below

Akhil is one of the students who are studying for gmat.
Akhil is the one of students who is studying for gmat.

You can notice in first sentence we are talking of students in general. Placement of "the" is additional help to see this.

I was able to find fancy word for these things - noun idea
If a noun subject and its prepositional phrase make up a complete "noun idea," then the adjective clause can describe either the first or the second noun in this "idea." For example:

The presents for my sister, who is turning sixty-five today, have not been wrapped.
The presents for my sister, which were purchased from the corner store, have not been wrapped.

In Sencond sentence we are talking of "Akhil". You can co-relate this with gmat question and see why subject is plural

In example link you posted - it matches the second type I explained - "the one"
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factors ....that ..keep - correct verb
as is the correct usage since spiraling out of control - an action is being compared here.

thus B
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I got the following notes from a book shared by someone in this forum.The name of the book is SC-Guide. I cant recall who shared it. Jump to page 105,


Mark is one of those independent carpenters who want to work for
themselves.
Marilyn is the only one of the gymnasts who wants to compete in the
Olympics.

In 2, The antecedent is "only" and thus the pronoun "who" agrees in number. I am a bit confused whether we can apply this rule directly to this question. In case the rule is applicable, then answer is C. However, there is a difference in the 2nd sentence and the question. Marilyn is one among many gymnasts and only she aspires for the Olympics. Other gymnasts are aspiring something else or nothing at all. The same logic can't be applied to this question as from the sentence it seems that all factors have a common purpose for preventing from letting the housing markets going out of control. So, I believe that the answer is B.

Its a very good 700+ level question
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+1 for B
One of the factors(plural)
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“Like it did” should not be used for an action but for a noun so A, D and E are eliminated.
The noun just preceding That is the Subject which is “factors” and hence “keep” should be the verb here. Hence “B” is correct.
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CR notes
http://gmatclub.com/forum/massive-collection-of-verbal-questions-sc-rc-and-cr-106195.html#p832142
http://gmatclub.com/forum/1001-ds-questions-file-106193.html#p832133
http://gmatclub.com/forum/gmat-prep-critical-reasoning-collection-106783.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html?hilit=chineseburned