Answer: D) The speed of light
The speed of light is approximately [tex]3 \times 10^8[/tex] meters per second.
[tex]3 \times 10^8 = 300,000,000[/tex]
In 1 second, a photon travels approximately 300 million meters
The other choices involve numbers that are well below the hundreds of million range, so scientific notation is not needed to shorten the number.