` 1 and 3 are correct.
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tonylDoesn't the past continuous suggest a longer time?Past continuous refers to a durational action during which another past action occurred; it does not normally indicate a result or consequence. This would be natural:
tonylSo I shouldn't ask a question like this:Why was Lisa studying in the library?Instead I should ask:Why did Lisa study in the library?Both are fine. These do not address the earlier situations you presented. Either could presume a greater context. That is why you will never get definitive answers about grammar in isolation.