"rule of thumb," or simple habit and common sense, and instead use the scientific method to study work and determine the most efficient way to perform specific tasks.
C. the expansion of Americas across the continent :)
The Berlin conference in 1878 was an agreement to divide up African colonies between European powers, such as Germany, Portugal, France< England and Belgium. This was also dubbed "The Scramble for Africa" and led to the exploitation of Africans, notably in Belgian Congo and Rwanda
France is the answer. Hope that helped!