According to the Figure Above, What is the Least Likely

Question

According to the figure above, what is the least likely explanation for the data after 1985?
A) immigration
B) introduction of new individuals to the population
C) increased resources in the area
D) emigration

Accepted Answer

The data shows a steady decline in population after 1985, which is unlikely to be caused by an increase in the number of individuals leaving (emigration).