If Bob has one piece of gum in his mouth, he gains a utility of 12. If he adds a second piece to the first, it yields a marginal utility of 6; adding a third will bring marginal utility of 1. Adding a fourth piece will make Bob choke, yielding a marginal utility of -4. We can say:
A. Bob's total utility from chewing four pieces of gum would be 23.
B. Bob's total utility will decrease if he chews the fourth piece of gum.
C. Bob's total utility decreases after the first piece of gum.
D. Bob's total utility will be maximized if he eats two pieces.
Answer: B
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