The diagram shows the relationship between the number of lemons and oranges needed for a juice recipe.

three%20rows%20each%20showing%201%20lemon%20and%202.5%20oranges

Based on the diagram, what is the unit rate for this recipe?

A.
3.5 lemons per orange
B.
3.5 oranges per lemon
C.
2.5 oranges per lemon
D.
2.5 lemons per orange