Sara didn’t like using ... a-computer
b-a computer
C- computers

I think a and c are both right but which one should i choose???

Explanation:

I don't know why, but something keeps telling me the answer is a computer.

- computer doesn't make sense to me

a computer is the most correct answer according to me, because article a is not specific, same as the question

Mystery hacker strikes again A hacker BREAKS into the government's website and replaced all the photos with cartoon characters. The attack HAPPENED on Saturday night, and investigators believe that the same person ALREADY Hack.ED into three other official networks. During Saturday night's attack the hacker LEFT a message to say that even a child could access the website. investigators HAVE NOT DISCOVERED anything about the hacker's identity since the attacks BEGAN

Explanation:

The gaps has been properly filled with the adequate words in their grammatical form with the words in the brackets put in their present perfect or simple past form