What is the concentration of the solution that results from mixing 40.0 mL of 0.200 M HCl with 60.0 mL of 0.100 M NaOH?
A) 0.150 M NaCl
B) 0.0200 M NaCl and 0.0200 M HCl
C) 0.0200 M NaCl and 0.0600 M HCl
D) 0.0600 N NaCl and 0.0200 M HCl