In paragraph 7 of "the negro artist and the racial mountain" hughes suggested that negro artist are given the message that their art should be
illusory
serious
expensive
superficial

Option-(C):

"In Paragraph 7 of "The Negro Artist and the Racial Mountain" Hughes suggested that Negro artist are given the message that their art should be expensive."

Explanation:

As the Langston Hughes, suggests that the poet who wrote the poem is a negro artist,but it is very clear that he does not like to live like one. As he prefers to be more like the White people in the town having less financial problems, like other negro poets or artist  had in that time. So, for the unknown poet it will be more of a business if they sell there artistic work on high rates, and be more expensive rather then working for just few pennies.

As, according to Langston Hughes each of the poet wants his worked not to be shared with the audience on low rates, as it will be very hard for them to live in society full of white people, who were much rich as compared to them.

tree and the cat in the tree