Final answer:
If it is 11 am Thursday in Seattle, the time in Seoul, South Korea is 4 am Friday.
Step-by-step explanation:
To determine the time difference between two locations, we can use the concept of time zones. Seattle is at 120 degrees west, while Seoul is at 135 degrees east. Each 15 degree difference corresponds to a one-hour time difference. Since Seoul is 255 degrees east of Seattle, we need to determine how many multiples of 15 degrees are in 255. There are 17 multiples, so the time difference between Seattle and Seoul is 17 hours.
If it is 11 am on Thursday in Seattle, adding 17 hours gives us 4 am on Friday in Seoul. Therefore, the correct answer is a) 4 am Friday.