Serfs were required to a
grind their own grain at home.
b
fight against the king's enemies.
c
move to nearby cities and towns.
d
stay on the land that they worked.

it looks like its all of the above. [.wpal1kojopfdpojfrfionrnif.knfdsnksjosjo]

explanation:

you have to combine all of your answers together to

.wpal1kojopfdpojfrfionrnif.knfdsnksjosjo

answer; i do believe that its(gestation,suction-aspiration or vacuum aspiration;