Answer:
d. Cloistered Government
Step-by-step explanation:
Cloistered Government - 
During the Heian period , this system was established , according to which an emperor may resign from his work , but still can get back the power , is referred to as cloistered government. 
It is a special form of Imperial government . 
The retired government have a significant part in the government matter.
Hence, from the given statement of the question, 
The correct term is Cloistered Government.