Answer:
b
Explanation:
increasing means the curve goes up.
between what values of x did this curve do that ?
I see the tendency to go up stays at x = -1 and ends at x = +3.
before and after these x-values the function is decreasing (going down).
and directly at these points the slope of the tangent is 0 (a horizontal line), so the function is neither increasing nor decreasing there. therefore we need to exclude the actual points from the interval (so, we use only "<" or ">" as symbols).
so, b is the correct answer.