15 pts for answer!

the table shows the ratio between the number of packets and the number of seeds of a certain plant contained in them:

number of packets number of seeds
5 15
6 18
7 21

which graph shows equivalent ratios?

a: a graph is drawn. the horizontal axis and vertical axis values are 0 to 15 in increments of 1. the horizontal axis label is number of packets, and the vertical axis label is number of seeds. points are plotted on the ordered pairs 1, 3 and 2, 3 and 3, 3.

b: a graph is drawn. the horizontal axis and vertical axis values are 0 to 15 in increments of 1. the horizontal axis label is number of packets, and the vertical axis label is number of seeds. points are plotted on the ordered pairs 1, 3 and 2, 6 and 3, 9.

c: a graph is drawn. the horizontal axis and vertical axis values are 0 to 15 in increments of 1. the horizontal axis label is number of packets, and the vertical axis label is number of seeds. points are plotted on the ordered pairs 1, 1 and 2, 2 and 3, 3.

d: a graph is drawn. the horizontal axis and vertical axis values are 0 to 15 in increments of 1. the horizontal axis label is number of packets, and the vertical axis label is number of seeds. points are plotted on the ordered pairs 3, 1 and 6, 2 and 9, 3.