At a given temperature, osmotic pressure of a concentrated solution of a substance:

1. Is higher than that of a dilute solution.
2. Is lower than that of a dilute solution.
3. Is same as that of a dilute solution.
4. Cannot be compared with osmotic pressure of dilute solution.

HINT: π α Concentration
Explanation:
According to definition of osmotic pressure we know that π = CRT. For concentrated solution C has higher value than dilute solution.

Hence, as concentration of solution increases osmotic pressure will also increase.