Answer:
(B)/the second graph
Explanation:
The given chart has a ratio of 1:3.
5:15 --> 1:3
6:18 --> 1:3
7:21 --> 1:3
Therefore, the graph must show this 1:3 ratio. For every 1 unit you plot in the x-axis, you must go up 3 in the y-axis. So the graph with the plots (1,3), (2,6), (3,9) will be your answer.
Hope this helps! :)