Correct Answer - Option 1 : after
The correct preposition is after.
- Let's look at the meaning of the given prepositions:
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after- happening at a time subsequent to a reference time
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across- to the opposite side
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along- with a forward motion
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in - to or toward the inside of
- As per the context of the sentence, the minister's resignation was desired subsequent to the scandal became known to everyone.
- Hence from the given meanings, we find that the preposition 'after' is the correct choice here.
Correct sentence: The Opposition party called for the Minister's resignation after the scandal had broken.