I have been preparing for the SAT, and this question has been confusing me a lot lately.
Some scissors (A) are designed for left-handed use, although most (B) of them (C) sold in stores (D) are not specialized.
When I initially read this sentence, I thought that B was incorrect (of them). I thought that it should have been "of those."
To my surprise, however, there is no error in this sentence.
Why is "of them" correct and when would it be appropriate to use "of those"?