Read the passage.

the history of the tortilla is vast. tortillas in whatever form are traditionally made from corn and usually prepared by baking them. one traditional and common method of making a tortilla is to use corn flour to make a dough. using this dough, the tortilla is formed and baked in the oven and enjoyed once it has cooled.

which conclusion can best be drawn from the paragraph?

a.
tortillas are a traditional food with a complicated history.
b.
there is more than one way to prepare corn tortillas.
c.
tortillas can only be made by using corn flour.
d.
corn is a staple food that is used in many different recipes.