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You're right, hydrogen can only have one electron, but in the s-orbital, you can have a two electrons. If you do electron configurations using the periodic table, you can see that the s-orbital, which is the first two columns, allows for a total of two electrons. I attached a picture to help visualize it. Hopefully that helps.
I was initially confused about this as well, but I think the key word in this question is "can," meaning what is the maximum possible electrons that can occupy the following orbitals. So, while it is possible to have 1 electron in an s-orbital, the most the s-orbital could hold would be 2 electrons.
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