Answer:
I am pretty positive its the last one, "How computer viruses can be prevented"
Explanation:
Computer Viruses are the problem, and how they can be prevented is the solution
Answer:
Julius Caesar
Jealous conspirators convince Caesar's friend Brutus to join their assassination plot against Caesar. To stop Caesar from gaining too much power, Brutus and the conspirators kill him on the Ides of March. Mark Antony drives the conspirators out of Rome and fights them in a battle. Brutus and his friend Cassius lose and kill themselves, leaving Antony to rule in Rome.
Answer:
extraneous - irrelevant or unrelated to the subject being dealt with
An idea intended to make the reader take notice and want to read on is called a hook