If I am not mistaken I believe it is true.
The answer is letter C.
Explanation: Is an employee who, within a service system, is bound by contract to work for a particular employer for a fixed period of time. The employer often allows assigning the work of a contract to a third party.
Christopher Columbus wanted to go to Asia but their navigation was not that great so he ended up in America. When he got to America he started to sail back goods that were in America to Europe to the Americas. That's how America got horses, cows, and pigs. They also got other things like oranges, sugar cane, and disease.
Hope this helped :-)