Answer:
b. Marginal utility is positive for the fourth slice and negative for the fifth slice
Explanation:
The law of diminishing marginal utility states that as consumption increases, the utility received from consumption falls.
A rational consumer would continue consumption until utility is maximised. After tilooty is maximised, further consumption would generate negative utility.
Total utility is positive for the 4 slices, if I continue consumption after the fourth slice, utility would become negative.
I hope my answer helps you