Marianne is a serf in the middle ages. after her village is attacked, her family

I would say C. local feudal lord and his knights.

Because in the Middle Ages, large estates called manors existed where serfs and peasants were taken in. Of course Marianne would have to work hard in the manor, though she would be under protection. I think that's the answer but I am not 100% sure. You  should view other sources if you still have questions. Hope I helped :)

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.