Question

Which solution contains the largest number of moles of chloride ions?

Which solution contains the largest number of moles of chloride ions? A) 30.00 mL of 0.100MCaCl2 B) 10.0 mL of 0.500MBaCl2 C) 25.00 mL of 0.400M KCl D) 4.00 mL of 1.000M NaCl E) 7.50 mL of 0.500MFeCl3

I know molarity is moles/liter and the answer is E, but I am not sure how to get to the right answer.