The table below shows how total donations, average donations, total labor costs and average labor costs vary depending on the number of employees State U hires for its fundraising activities. 
The net benefit of hiring fundraisers is largest when ______ employees are hired.
Definitions:
Hamilton's Rule
A principle stating that an act of altruism is favored by natural selection if the genetic gain of the recipient, discounted by the relatedness between the altruist and the recipient, exceeds the cost to the altruist.
Adaptive
Traits or behaviors that enhance an organism's ability to survive and reproduce in its environment.
Multilevel Selection
A concept in evolutionary biology that argues selection operates not just on individuals, but also on groups, genes, or traits at different biological hierarchy levels.
Eusociality
The highest level of social organization in animals, characterized by cooperative brood care, generational overlap, and a division of labor between reproductive and non-reproductive individuals.
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