A Solution Is Prepared by Mixing 70

A solution is prepared by mixing 70.0 mL of 0.100 mol L^-1 HCl and 30.0 mL of 0.200 mol L^-1 NaCl. What is the molarity of chloride ion in this solution?

A) 0.186 mol L^-1
B) 7.69 mol L^-1
C) 6.50 mol L^-1
D) 0.0100 mol L^-1
E) 0.130 mol L^-1