Answer:
B is your answer!
Explanation:
It is the only word that really fits. Three lives are what the sentence speaks of
1. His past existence
2. His present one
3. The next life
This is three lives so the sentence should say:
It became common to speak of the samurai's allegiance to his lord as lasting the duration of three lives... his past existence, his present one, and the next life...
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~Ace <3
