Final answer:
The correct answer is option c) To practice swordfighting.
Step-by-step explanation:
The character Centorea from the manga and anime series Monster Musume has a replica sword for multiple reasons, but primarily, it serves as a symbol of her heritage and for practice swordfighting. As a centaur, she upholds the traditions of her culture, which includes being skilled in warfare and combat.
While the sword might also be used for defense or as a decoration, within the context of the series, Centorea's fidelity to her values and great pride in her skills make practice swordfighting the likeliest reason for having a replica sword. It may also impress Kimihito due to her expertise and dedication, but that is not the primary purpose of the sword.