Which of the following is not a factor that led to the decline of the roman empire?
roman emperors and generals fought over land
the army kept barbarian tribes from entering territory
the empire was too large to govern
disease killed many citizens

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

your answer is a hope this

a case involving the laws of a single state.