Answer:
Choice B. Constant function.
Explanation:
The function shown is a horizontal straight line which is generally represented by the equation y = c which is a constant function; therefore, the correct choice is B.
Going through other choices, we see that the function cannot be a cubic function ( because the graph is flat), nor an absolute value function, nor an identity function (the function is not y = x)
.
Hence, choice B stands correct.