Hi there!
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I believe your answer is:
"They attempt to compare the similarities and
differences between two or more subjects.
"
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Here’s why:
- Literature that fall under a 'compare and contrast' structure would discuss the similarities and differences of two or more topics.
- A compare-and-contrast essay would do the same thing, they would attempt to "compare the similarities and differences between two or more subjects."
- The first choice describes problem and solution, the second chose is the purpose of a persuasive essay, and the fourth option describes cause and effect.
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Hope this helps you. I apologize if it’s incorrect.