Answer:
Claiming certain politicians were communists
Explanation:
Sacrificial rituals, they killed people, spilled their blood on altars. It was an honor to be a sacrifice. Sometimes, the rituals claimed to need virgins or women, or both.
The best explanation why the area between Spain and Gaul was not part of the Roman empire until that later period was a culmination from both undesireability and difficulty in accessing this region due to its mountaineous nature. So I would wager the answer being both C and D - undesireability and difficulty in access.