Why did i get this question wrong?

its about a u shaped tube with a simepermeable membrane

0.3 M Fe (NO3)2 <~ U
~> 0.5 M sugar
0.1 M NaCl
So I did this:
0.3 x3 = 0.9

0.5x1=0.5
0.1x2=0.2
= 0.7

so i chose the answer increase in the water level to the left side of the tube.

why is my answer wrong?