Answer:
The answer is A: Ask family and friends about their experiences.
Step-by-step explanation:
B does not make sense, as if you were to let an unknown person online essentially take control of your computer, they might make the problem worse.
C might make sense at first, but if you read the question carefully, it says to try every solution available, and that's not always a good idea.
D does not make sense, as a firewall does not slow down your computer, it blocks unknown users that aren't yourself from accessing your computer, essentially another line of security on top of an anti-virus.
Therefore, the answer would be A, because, assuming her friends and family members have computers, might know how to help her fix her problem.