Answer:
Option: D is the correct answer.
D. y is all real numbers.
Explanation:
Domain--
It is the set of all the x-values for which the function is defined.
Range of a function--
It is the collection of all the values that is obtained by the dependent variable i.e. it is the set of all the values which a function takes in it's domain.
By looking at the graph we observe that the function is increasing strictly and is a continuous graph which increases from minus infinity to plus infinity.
and in this domain the function takes all the real values.
i.e. the range of the function is:
(-∞,∞)