What three sources have contemporary scholars and historians used to learn about the history of africa?.

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.  

the answer is a. since they were a huge producer of cotton and wanted the most money for it.

the percentage of students at the school need special diets is

c) 10 percent