Answer:
Section of the function which is constant is C
Step-by-step explanation:
Any line parallel to x-axis has a slope of zero and in this figure we can see that the section C only is parallel to x-axis and since it parallel to the x-axis it has a slope of zero hence the function at C is neither increasing because it doesn't have a positive slope nor is it decreasing because it doesn't have a negative slope so it remains constant.
