Which sentence correctly uses punctuation with a subordinating conjunction?

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She studied hard; and she passed the test.
She needed to study: because she passed the test.
Because she studied.
Because of her studying, she was able to pass the test.

Because she studied.

wrongggggggggggggggg

Apologies for the mistake. The correct sentence that uses punctuation with a subordinating conjunction is:

She needed to study because she passed the test.