Answer:
c. folkway
Explanation:
In sociology, the term folkway refers to the conventions we have in our daily life. In other words, it refers to the conventions a culture has of what's appropriate or not in society and this provides a "traditional" way of behavior.
In this example, we are asked how wearing soiled clothing might be viewed from a sociological perspective. We can see that wearing soiled clothing is viewed as something not appropriate in our society and doing this can be viewed as going against a social convention ("you need to wear clean clothes in public").
Therefore, from the sociological perspective, wearing soiled clothing might be viewed as violating a c. folkway.