Recall the Application About the Use of Fertilizer and Its

Multiple Choice

Recall the Application about the use of fertilizer and its impact on crop yields to answer the following question(s) . The table is taken from this Application.
Fertilizer and Corn Yield

-Diminishing returns occurs because

A) not enough people have jobs.
B) one of the inputs to the production process is fixed.
C) consumers don't buy enough of the products produced.
D) two people have not satisfied their self-interests.