Answer:
C
Explanation:
The other 2 make no sense and value is a balance of light and dark.
It needs a aperture, compound lens, a photosensitive plate or paper, and a included box for the photosensitive paper to not get exposed by other light sources or a box that is black covered inside and out to not reflect any other light other than what comes thru the aperture or the shutter to precisely capture a amount of light to expose the film properly and not over or under expose it.
Most likely harmony, the degree to which a person appreciates the harmony depends on various things such as: their level of musical training, their ear, and again just their opinion.<span />
