I'll first explain what the non-aggression pact was. It was an agreement that the Soviet Union and Germany would take no military action against each other. To answer your question it is B. The pact was to make sure he could safely attack Poland.
Belarus, cambodia, Cameroon, chad, china, cuba, Egypt, Equatorial Guinea, eritera, Ethiopia, iran, lyiba, Madagascar, Myanmar, north korea, Rwanda, sudan, Syria, Tunisia, Turkmenistan, Uzbekistan, Vietnam ,and Zimbabwe
The third option is the answer
