We want to know to which of the letters corresponds to 56. To do this, let's first write this fraction as a decimal by dividing the numerator by the denominator.
We see that 56 = 0.833... This means that 56 is between 0.83 and 0.84.
0.83 < 0.833... < 0.84
Let's mark these bounds on the number line and see which letter falls between them.
Only letter D falls within these bounds, so D shows the graph of 56.