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.