A horizontal, uniform board of weight 125 N and length 4 m is supported by vertical chains at each end. A person weighing 500 N is sitting on the board. The tension in the right chain is 250 N.
What is the tension in the left chain?
(A) 250 N
(B) 375 N
(C) 500 N
(D) 625 N
(E) 875 N