Final answer:
The correct answer is c) Shepherds, swains. Gray advises against looking down upon the humble villagers, emphasizing the importance of not disregarding or disrespecting those who belong to lower social classes.
Step-by-step explanation:
The correct answer is c) Shepherds, swains. In the given context, Gray is advising against looking down upon the humble villagers. The use of the words 'shepherds' and 'swains' refers to the common people, specifically those who work in rural areas. By using these terms, Gray emphasizes the importance of not disregarding or disrespecting those who belong to lower social classes.