It’s most likely to be (C)
For 391 years, going from 794 to 1185, the real power in Japan was in the hands of the Fujiwara family (A option), they achieved that by monopolizing regent positions. The seize of power by abdicated emperors at the 11th century followed by the rise of the Samurais led to Fujiwara's gradual decline.
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Virginia Plan
Each of the states would be represented in proportion to their “quotas of contribution, or to the number of free inhabitants.” States with a large population would thus have more representatives than smaller states. Large states supported this plan, while smaller states generally opposed it.