The Fujiwara rose to power by

A. Making the fortune through trade
B. Waging war on other clans
C. Having their daughters marry emperors
D.defeating the Mongol invaders

C. Having their daughters marry emperors

The Fujiwara clan, a powerful aristocratic family in Japan, rose to prominence especially during the Heian period (794-1185) by employing a strategy of intermarriage with the imperial family. They ensured that their daughters became consorts to emperors, which allowed them to control the administration by having their own members appointed to key government posts. They often acted as regents for minor emperors, thereby consolidating their influence over the court and the country.