Answer:
The equation that represents an inverse variation with a constant of 56 is:
Option: D
D.
Explanation:
Inverse Variation--
It is a relationship between two variables such that it is given in the form that:
If x and y are two variables then they are said to be in inverse variation if there exist a constant k such that:

i.e.

Here the constant of variation is 56
i.e. k=56
Hence, we have:

Hence, option: D is the correct answer.