Ann: Sure. I have two pens. This pen has black ink. That pen has red ink.
Which pen do you want? Or Which one do you want? Or Which do you want?
(b) Sue: I like these earrings, and I like those, too.
Bob: Which (earring/ones) are you going to buy?
Sue: I think I’ll get this
In (a): Ann use which (not what) because she wants tom to choose. Which is used when the speaker wants someone to make choice, when the speaker is offering alternative: this one or that one, these or those
Which can be used with either singular or plural nouns.
(c) Jim: Hare’s a photo of my daughter’s class
Kim: Very nice. Which one is your daughter?
Which can be used to ask about people as well as things.
(d) Sue: My aunt gave me some money for my birthday. I’m going to take it with me to the mall.
Bob: What are you going to buy with it?
Sue: I haven’t decided yet.
In (d): The question doesn’t involve choosing from a particular group of items, so Bob use what, not which.
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