We need a link between the first piece and the second piece.
N, S, T and V all share links with N and T (the pieces that can go second.) So any one of them could go in 1.
Onyx doesn’t share an instrument. Onyx can only go beside S or V. So B is CORRECT. If Onyx goes in 1 then we won’t have a link between 1 and 2.
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