Two trucks can’t both be red if they come beside each other. From our diagram, the only trucks that are definitely beside each other are T/W and S.
B is CORRECT. T and S are always beside each other (even though T could be in 5 or 7.) Therefore at least one of them has to be green.
A is wrong because X could go in 1 or 3 and therefore be red. And there’s no rule stopping S from being red.
C is wrong because U could go in 3 and therefore be red.
D is wrong because T and W could both be red if S is green.
E is wrong because Z could go in 1 and X could go in 3. Then they would both be red.
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