The answer is A: extreme nationalism.
Although totalitarian regimes have been present for as long as politics have been conceived and their specific characteristics are extremely varied, one common trait amongst all totalitarian regimes has been a strong focus on land and its relation to ascendance, always creating a strong sentiment of fear and hatred for foreigners´ intervention and influence in the composition of what is believed should be a privileged native group of people (like the Aryan race in Germany during the rule of Hitler).