It's inflation. But anyways, the answer is C. Real
The phrase “in real terms” is used to show how measures such as economic growth, savings or wages change after inflation, while “nominal terms” is used when the adjustment has not been made. Changing terms to real enables comparison of quantities as if the prices never changed. Changes in nominal value, on the other hand, reflect at least in part the effect of inflation.
The force driving behind European Imperialism in Africa was when the Europeans took advantage of advances in technology to enhance their ability to acquire resources from Africa.
