Laura Sells an S&P 500 Futures Contract with a September

Laura sells an S&P 500 futures contract with a September settlement date when the index is 1,750. By the settlement date, the S&P 500 index falls to 1,400. The return on Laura's position in the S&P 500 futures contract is ____ percent.

A) -20
B) -10
C) 25
D) 20
E) 0