Final answer:
Kimihito becomes Cerea's Master because Cerea, adhering to her knightly values, believes Kimihito saved her life and chooses to serve him out of a sense of honor and loyalty.
Step-by-step explanation:
The main question here is how did Kimihito become Cerea's Master in the context of the Japanese manga series. The correct answer is d) She chose him as her Master. Cerea, a centaur character from the series 'Monster Musume', believes in a strong sense of honor and loyalty. When Cerea meets Kimihito, she mistakenly believes that he has saved her life, and due to her knightly values, she swears loyalty to him and decides to serve him as her Master.The relationship between Kimihito and Cerea is based on her own determination rather than any formal adoption, battle, or misunderstanding. This bond highlights the importance of honor and service in her character's ethos, which is deeply rooted in the chivalric traditions that her character is inspired by.In conclusion, Kimihito becomes Cerea's Master because she feels indebted to him and willingly chooses to serve him, following the code of chivalry she adheres to.