Which of the following is a value of x for which the expression  is undefined?

The correct answer is: 2

Hint:
For a fraction to be undefined, the denominator of the fraction must be zero. For example, let is a fraction, where a and b both are real numbers. The said fraction will be undefined if b = 0. We use this concept to get the value of x.
Explanations:
Step 1 of 3:
The expression is given by, 
For the above expression to be undefined, the denominator should be 
Step 2 of 3:
Now, we have 




Hence, x = -5, 2
Step 3 of 3:
From the given choices of x-values -5 is not available. So, the value 2 is the best choice.
Final Answer:
The required value of x is— D) 2.