Which of the following is the most important reason to include proper punctuation when incorporating information from other sources? to make your sentences longer to create a more complicated paper to prevent plagiarism to avoid annoying readers

to prevent plagiarism

inserting quotation marks when incorporating information from other sources let's the reader know that those are not your words. if you don't put quotation marks around the phrase, it looks like you wrote it, which you didn't, therefore you are wrongly taking credit for the work - aka plagiarism.