Final answer:
Light travels 1 meter through a vacuum in 1/299,792,458 of a second, conforming to the definition of the meter based on the speed of light.
Step-by-step explanation:
The distance that light travels through a vacuum in 1/299,792,458 of a second is defined as 1 meter. This is because the speed of light in a vacuum is precisely 299,792,458 meters per second, and when you multiply the speed by the time (which is basically the definition of distance), that results in light travelling 1 meter in the specified duration. Therefore, the correct answer to the question is a) 1 meter.