I assume here that the "some" and the pronoun refer to the same person/people: otherwise the task would not be solvable, because we would not have enough information (it could be a "she" too) otherwise.
if you look at the first part of the sentence, you will see "some take" - the verb is in plural. So it means that the pronoun also has to be in plural: "them".
So the correct answer is "them".
