Final answer:
The steady light angle of visibility cannot be determined without more information.
Step-by-step explanation:
In the context of light angles, the angle of visibility refers to the angle at which an object or light source is visible from a particular point. The steady light angle of visibility can vary depending on the situation. In this case, we are given four options: A) 140 degrees, B) 90 degrees, C) 180 degrees, and D) 45 degrees.
Without additional information about the specific scenario, it is not possible to determine the correct answer. Each of these angles could be a valid angle of visibility depending on the context. Therefore, the correct answer cannot be determined without more information.