Which sentence correctly uses past perfect tense?
A. Elizabeth I held on to her crown because she falsely promised to
marry the suitor.
B. Nobunaga united the warring factions of feudal Japan through his
brilliant tactics.
C. Suleiman had felt ready to invade Hungary because he had
conquered Belgrade.
D. Alexander was able to invade Persia because he had pacified his
rivals in Greece.
