Double check 4
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The correct answer is Re5 double check.
Diagram 1 shows the position at the end of the last page
Diagram 2 shows what happens if the rook moves to e5. The king is in check from the bishop and the rook.
Diagram 3 shows that if white takes the pawn with his rook Rxb7, then the black king is only in check once, from the bishop.