As x increases, the y value, the value of our function, decreases. So a calculus-based justification, without even looking at the choices, well, I could look at the derivative, and we're going to be decreasing if the slope of the tangent line is negative, which means that the derivative is negative. And we can see that for x is greater than three, the derivative is less than zero. So my justification, I haven't even looked at these choices yet, I would say for x is greater than three, f prime of x is less than zero. That would be my justification, not even looking at these choices. Now let's look at the choices. F prime is decreasing when x is greater than three.