Answer: Option (D) is correct.
Explanation:
Correct Option: The average product curve must be rising.
The relationship between the marginal product curve and the average product curve divided in three parts:
(i) when the marginal product curve lies above the average product curve then the average product curve must be rising.
(ii) When the marginal product curve lies below the average product curve then the average product curve must be falling.
(iii) Intersection between the two curves will be at the highest point of the average product curve.
