In the context of using ketchup as a medium in a protest piece against fast food restaurants, the most fitting option would be "convey a message." The use of ketchup can symbolize issues related to fast food, such as health concerns and the impact of fast food culture on society.
Ketchup is a non-traditional material, but da artist used it in his protest piece against fat food resturants bc of its ability 2
Resist decay
Convey a message
Deteriorate quickly
Attract flies
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