Which Solution, If Either, Would Create the Higher Osmotic Pressure

Which solution, if either, would create the higher osmotic pressure compared to pure water) : one prepared from 1.0 g of NaCl in 10 mL of water or one prepared from 1.0 g of CsBr in 10 mL of water?

A) They would have the same osmotic pressures.
B) NaCl would give the higher pressure.
C) CsBr would give the higher pressure.
D) It is impossible to tell.
E) These compounds are salts and do not produce an osmotic pressure.