If We Were to Send a Laser Light Pulse Toward

Multiple Choice

If we were to send a laser light pulse toward the Moon and some of this light were to be reflected toward Earth from retro-reflectors left on the Moon by astronauts,how long after the transmission of the initial flash would the reflected light be detected through a telescope on Earth?

A) 2.56 microseconds
B) 2.56 seconds
C) 1.28 seconds
D) 1.28 milliseconds