Answer: B.
B.The more pizza joe eats , the less he enjoys an addiitional slice .
Explanation:
The Law of Diminishing Marginal Utility states that : As consumer consumes more & more of a commodity , the marginal utility attained with each succesive unit consumption keeps on declining .
(Marginal Utility - Additional satisfaction from additional units of a good's consumption)
This is based on some assumptions that : Consumption is continous (without break) , its in reasonable quantities (eg - water not in spoons) , goods quality is identical ,
The law depicting decreasing Marginal Utility with consumption , also implies Total Utility rising at diminishing rate
(Total Utility = Total satisfaction from total units of consumption)
Hence deriving (d) - TU is max when MU is zero
because if consumption increased beyond this point , will make MU negative & so reduce total TU