According to the CME Group website, 1-tick is equal to 0.25 index points and worth $12.50 for each E-mini S&P500 futures contract. If you bought 1 contract when the index was 2,960 and one month later you sold it when the index moved down to 2,950, what would be your ROIC if the initial margin was $6,300?

a.-2.0%

b.-16.9%

c.-1.7%

d.-7.9%