Which of the Following Was True of Shoen

Which of the following was true of shoen ?

A) often at the center of the struggle for power among rival shoguns
B) one of the Japanese empire's greatest sources of revenue
C) rented out to various monasteries over the years for rice cultivation
D) parcels of productive lands owned by monasteries and government officials
E) given to the samurai as rewards for valor in battle, but the samurai were less than successful as feudal lords