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
The sentence needs commas because the participial phrase is essential.
Answer:
Option c
Explanation:
Dr. King’s main points are as follows: we were promised freedom; now is the time to honor that promise; and we will not be satisfied until we are free.