Choosing role models is particularly challenging for virtue ethics because it lacks a systematic method for identifying universally accepted individuals across diverse cultures. This difficulty arises from the subjective nature of moral virtues and the cultural variation in values. Therefore, the answer is option A.
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Virtue ethics focuses on moral character but struggles to provide clarity on how to choose role models, as this involves subjective interpretations of virtues. It does not have a systematic approach for identifying universally acceptable role models across diverse cultures. This distinction makes option A the one that virtue ethics finds challenging to explain. ;