In making a large pot of chili for a family reunion, you find that you have to add 1 onion to your pot of chili that already has 5 onions mixed in it to notice a difference. According to Weber’s Law, how many onions would you have to add to notice a difference if you are making twice as much chili with 10 onions?

a. 2

b. 1

c. 3

d. 4