Sentence examples for which of them from inspiring English sources

"which of them" is correct and commonly used in written English
It is typically used in a question to refer to a specific group or set of people or things. For example: - Which of them is your favorite book? - I can't decide which of them to choose for my presentation. - Please tell me which of them you prefer, the red shirt or the blue one? - We need to determine which of them are eligible for the scholarship.