The correct answer is "It is against their cultural norms to make extended eye contact."
The first records of Amish who emerged after Anabaptist movement can be tracked back on 17th century. Amish society is one of the most conservative societies living in America nowadays and their members are traditionalist Christian church followers. A few examples of their conservative lifestyle is living live without curtains in houses, never painting the walls, while working in the fields Amish are not allowed to use tractors, there is also a strict dress code applied both for men as well as women. And one of the restrictions for women is also including prohibition of making extended eye contact with male customers.
I believe The answer is A.a class system
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Saigon was renamed H0 Chi Minh city
