What is the most likely cause of the change in population size in year 6 shown in the graph below? A graph with Years on the x-axis from 4 to 7 and Rabbits on the y-axis from 0 to 400, by hundreds. The line begins at (0, 95), small increases and decreases through year 6, then increases greatly to end at (7.25, 275). a. An increase in the amount of land available b. A decrease in the amount of land available c. A cold spring d. A hot summer