Which of the following is the best summary of "Cereal"?

W. In 1894, Will Keith Kellogg and his brother, physician John Harvey Kellogg, invented the first precooked flaked cereal. The most important ingredient to any breakfast cereal is grain. Large ovens cook the grain to the desired color, flavor, and dryness. Grain ground into flour is cooked in a cooking extruder, which has a long screw and a heating mechanism. After shaping, the cereal may be coated with flavors.

X. Cereal was invented at the Western Health Reform Institute, located in Battle Creek, Michigan. Will Keith Kellogg and his brother John Harvey Kellogg made healthy food for their patients. Cereal was one of their inventions. Will founded the Kellogg Company, and C.W. Post, a patient of theirs, founded a company of his own. Cereal is made by cleaning and inspecting corn, wheat, oats, rice, and/or barley. It is cooked in a pressure cooker or cooking extruder.

Y. Nine out of ten homes in America eat cereal, but not many people know how cereal was invented or how it is made. The passage answers these questions. Will Keith Kellogg and his brother John Harvey Kellogg invented the first cereal. Will went on and founded the Kellogg Company, which makes the best corn flakes. The manufacturing process begins with the most important ingredient, grain. It is cleaned and inspected, mixed with other ingredients, and then baked in an oven.

Z. The author of the passage shares what he or she has learned about the invention and the production of cereal. Will Keith Kellogg and John Harvey Kellogg invented the first precooked cereal when they accidentally forgot about a pot of boiled wheat; the resulting food became a huge success. Today, cereal is made by processing grain, mixing and cooking it with other ingredients, and shaping it with metal rollers. The grain is then cooked again in large ovens.