Answer:
The correct one is B. it decreased
Step-by-step explanation:
First of all you have to read the names of the axis:
-On the X axis you have "time"
-On the Y axis you have "population"
In this case we see that the graph is a straight line that descends, there is an inverse correlation between both variables. The inverse correlation occurs when increasing one of the variables (time) decreases the other (population).