Jack recently planted a beanstalk and decided to measure its height each day. Jack plotted the following points on a graph, where the x-axis represented the day and the y-axis represented the height of his new beanstalk: (0,0); (1,2); (2,4); (3,6); (4,8); (5,10).

Which of the following correctly interprets the average rate of change?

A. Jack's beanstalk grew 2 units every day.
B. Jack's beanstalk grew 2 units every three days.
C. Jack's beanstalk grew 1 unit every day.
D. Jack's beanstalk grew 1 unit every two days.