Containers of oats are prepared in advance for a baking project. Later, raisins are added to the oats to make granola bars. This table shows the rate relationship between oats and raisins.

Cups of Oats (x) Cups of Raisins (y)
1
0.5
2
1
3
1.5
4
2
5
2.5
Which answer choice includes both a function that describes this relationship and correctly explains how?

y = 2 x, because the recipe calls for a ratio of 2 cups raisins per cup of oats.
y = x , because the recipe calls for a rate of 1/2 cup raisins per cup of oats.
y = x , because the recipe calls for a rate of 2 cups raisins per cup of oats.
y = 2 x, because the recipe calls for a rate of 1/2 cup raisins per cup of oats.