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The original play does not mention anything about contact.
It sounds to me like B4 grabbed the ring so he wouldn't land on A3 who moved into his landing spot. By the time he came down, A3 was gone and B4 landed safely. If there was contact during the play, then foul on A3. If there is no contact, then no foul.
However, if there WAS a foul, then there is no correct answer to choose from.
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