Why was the fujiwara clan important

Fujiwara Family: Dynastic family that, by shrewd intermarriage and diplomacy, dominated the Japanese ... the Fujiwara rise to power was gradual, its founding in the 7th century foretold its future role and importance.

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.

Ithink the answer is c sorry if i’m wrong