Answer:
Spyware
Explanation:
The reason why you noticed your computer has been running slow is because of spyware, which is considered to be very bad to get on your computer. When a user opens his/her web browser, the user receives ads that are misleading to the user, which fools the user of thinking it's something real and not a scam. Not only that, the user also receives pop-up ads that can, as mentioned, trick the user to think that it's real and not fake. Finally, the user's search results will be manipulated. In conclusion, spyware is, in fact, the main cause of the scenario.
The answer that isn't an example of plagiarism would be 'D. Quoting with Source' that means you are giving credit where credit is due and not taking or copying other work which is the definition of plagiarism.
I'm not sure about the second one but I believe it might be 'A. Students and Teachers'.
Hope this helped!