The graph shows the number of earthquakes in a particular country. The x-axis represents years, and the y-axis represents the number of earthquakes.

What does the average rate of change tell you?
Choices:
A:The number of earthquakes per year increased by 6 each year.
B:The number of earthquakes per year did not change.
C:There were a total of 6 earthquakes over the 4 years.
D:The number of earthquakes per year decreased by 6 each year.
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: The graph shows the number of earthquakes in a particular country. The x-axis represents years, and the y-axis represents the number of earthquakes.

What does the average rate of change tell you?
Choices:
A:The number of earthquakes per year increased by 6 each year.
B:The number of earthquakes per year did not change.
C:There were a total of 6 earthquakes over the 4 years.
D:The number of earthquakes per year decreased by 6 each year.
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: The graph shows the number of earthquakes in a particular country. The x-axis represents years, and the y-axis represents the number of earthquakes.

What does the average rate of change tell you?
Choices:
A:The number of earthquakes per year increased by 6 each year.
B:The number of earthquakes per year did not change.
C:There were a total of 6 earthquakes over the 4 years.
D:The number of earthquakes per year decreased by 6 each year.