Final answer:
Miss Crawford regards Mr. Radley as a man of piety due to his overt religious behavior and strict observance of Christian morals, indicating a strong devotion to his faith.
Step-by-step explanation:
Miss Crawford likely perceives Mr. Radley as a man of piety because of his outward expressions of faith and his seemingly strict adherence to Christian ethics and rituals. Piety generally refers to religious devotion and reverence to God, which can sometimes be demonstrated by an individual's consistent participation in religious activities, their moral conduct, and the seriousness with which they approach their faith. People within a community might view someone as pious if they regularly attend church services, are involved in religious community service, and uphold and propagate religious principles in their daily life and interactions with others.