option C

A.it can be potentially dangerous for people with tight budgets, whose --- Incorrect use of pronoun "It" with plural subject "variable rate mortgages"..
B. they can be potentially dangerous for people with tight budgets, because their --- Presence of" their" is ambiguous
C. they are potentially dangerous for people with tight budgets, whose --- correct { "whose" is correctly pointing to "people with tight budgets"
D for people with tight budgets, it can be dangerous, because their --- same as A
E. for people with tight budgets, they can be potentially dangerous in that their -- Incorrect use of that

Is 'whose' in option C not referring to 'budgets' ?

In choice (B), isn't "can be potentially" redundant?

Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.