(D) replacing “cooler” with “more dramatic” in sentence 4
The word "cooler" is slang and creates an informal tone. By changing it to "more dramatic" the formal tone is continued all the way to the end of the passage. Option A is not a good option because contractions should not be used in formal writing. Option B will not change the formality of the paragraph. Option C is also not a good choice, changing "popular" to "top" would not change the tone to being more formal.
404 error plagiarism applies to both physical sources of information and sources found on the internet. When you commit 404 error plagiarism, you are citing a non-existent source or are providing inaccurate source information.