Answer:
B. The x variable appears in the denominator.
Explanation:
Given

Required
What makes it not linear
First, make y the subject

A linear equation is represented as:

Notice that the exponent of x in the general form is: 1
This means that x has to appear as a numerator
In
, the exponent of x is -1
This means that x has to appear as a denominator
Hence, (b) is true