A) Total output always decreases when more units of input are added.
B) Marginal output increases indefinitely with additional input.
C) Adding more of one input, while keeping other inputs constant, will eventually result in smaller increases in output.
D) Marginal utility is constant as consumption increases.
For Explanation Click Here:
The law of diminishing marginal returns occurs in the short run when at least one factor of production is fixed. Adding more of a variable input (e.g., labor) leads to smaller increases in output after a certain point.