Which of the following is an odd function?

 The odd function is (D)

Step-by-step explanation:  We are given to select the odd function from the options.

AN ODD FUNCTION:  A function f(x) is said to be odd if f of negative x results in negative of f of x.

That is, f(-x) = - f(x).

Option (A) is

Putting x = -x, we have

So, this function is not odd.

Option (B) is

Putting x = -x, we have

So, this function is not odd.

Option (C) is

Putting x = -x, we have

So, this function is not odd.

Option (D) is

Putting x = -x, we have

So, this function is odd.

Therefore, the correct odd function is

Thus, (D) is the correct option.