The keys are on the table.
On means کسی چیز کے اوپر ہونا
The correct answer is above.
The preposition "above" indicates that the book is positioned higher than the shelf.
Usage of Over & Under
Over = something is placed higher but no physical contact.
Under = Something is placed below
There is a fan over my head. There is a pen under my bed.
In is used with morning/evening.
He came in the morning.
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