<span>The reflection of sunlight off of the moon's surface can only be seen when the earth is in the path of the reflected light. Essentially when the moon is not full, you see part of the moon that is in shadow. This is the same as looking at a part of the earth where it is night time, from space.</span>
Right off the bat you can cross out idiom off the list, which leaves us down to slang, jargon and dialect. It isn't very likely it's dialect since that refers more to regional language or a specific group of persons. Now we are down to two possible answers, slang and jargon. Slang is categorized as very informal and is not connected to a particular group or profession. I'm not sure which English you are in but jargon is one of the rhetorical devices learned in AP Language and Literature. To be more specific, jargon IS the language which is involved with a particular group or profession. For example, in terms of running some jargon could be "fartlek" and "strides".
A. is corrrect because it makes sence "the peices fit" as i would say
