For which interval is the average rate of change of f(x) negative?

On a coordinate plane, a function starts from above quadrant two and goes through (negative 4, 0) to (negative 3, negative 3). The function then curves upward toward (0, 1) and then curves down toward (3, negative 3). The function then curves up and approaches x = 5.

from x = –4 to x = –1
from x = –3 to x = 3
from x = 0 to x = 2.5
from x = 3 to x = 4.5

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.