Consider the following table that shows the number of trucks owned by a delivery firm and the corresponding number of deliveries made. Use the table to answer the following questions. 
-Diminishing returns set in after the ________ truck is purchased.
Definitions:
Contagious Illnesses
Diseases that can be transmitted from one person to another through direct or indirect contact.
Biological Explanations
Descriptions of phenomena or behaviors based on biological factors, such as genetics, biochemistry, or anatomy.
Information Processing
The way human beings take in, use, and store information.
Efficiency of Cognition
The effectiveness with which the brain processes information, often relating to speed and accuracy in cognitive tasks.
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