Answer:
Option C, attacking and controlling the African country of Ethiopia, was NOT taken by Germany in the years leading up to World War II.
While Germany did create an air force (option A), increase the size of its army through conscription (option B), and send troops into the demilitarized Rhineland (option D) during the 1930s, it did not directly attack and control Ethiopia. However, Germany did provide military support to fascist Italy during Italy's invasion of Ethiopia in 1935-1936, and the conflict was seen as a precursor to World War II.