Final answer:
If it were four hours later, it would be half as long until midnight as it would be if it were two hours later. The current time is 8:00 PM.
Step-by-step explanation:
To solve this problem, let's work backwards. If it were two hours later, the time until midnight would be twice as long as it is now. Therefore, there would be 4 hours until midnight. Now, if it were four hours later, the time until midnight would be half as long as it is when it's two hours later. So, there would be 2 hours until midnight. Putting it all together, we can conclude that it is currently 8:00 PM (option b).