4

What punctuation should I use in a question that offers alternatives?

What do you like, cheese or bacon?

What do you like? Cheese or bacon?

3

What do you like, cheese or bacon?

This is the grammatically correct way of saying this.

What do you like? Cheese or bacon?

This is more informal and colloquial.

Alternatively, if you were listing items, you could use a colon.

Which do you like: cheese, bacon, or cheesy bacon?

Note, you do not capitalize after the colon.

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1

Informally, I think both are OK. But in a strict sense

What do you like, cheese or bacon?

seems better to me. "Cheese or bacon?" by itself is not a complete sentence.
Also, which might be better than what, as a limited choice is implied.

To make this simpler, you might say

Do you like cheese or bacon?

which has the same meaning.

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