The painting was seen as a challenge to social conventions because it represented a socially undervalued, lower class that was outside the country's elite.
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This is because the change in audience offended members of the upper classes, who felt they were being left behind and equated with the poorer classes.
You didn't present the painting, or the answer options, which makes it impossible for me to write a specific answer. However, I hope the above information can help.
More information about social classes at the link:
https://brainly.com/question/7102486