11.It is common belief that placing a metal object11 while cooking will speed up the cooking of meat.Bryan set up an experiment to find out if this is true. He prepared three kettles with different amounts of meat and the same amount of water. He placed the spoon in one kettle, two spoons in the second and no spoor on the third kettle. How can you improve Bryan's design?

A. Place the same amount of meat in alll kettles
B. Use pork,beef,chicken instead of just one type of milk
C.Use beef as the meat because it takes longer time to cook
D.Use stainless kettle because they conduct conduct heat faster.

the lesson was variables
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