Final answer:
To provide safety and stability, a ladder should ideally be set up at a 75-degree angle. This angle adheres to the 4-to-1 rule for ladder safety, which can prevent the ladder from tipping over or sliding out.
Step-by-step explanation:
In the context of safety, ladder setup typically follows a 4-to-1 rule that refers to the ratio of the ladder's length to the distance at its base from the wall. Therefore, a ladder set at approximately a 75-degree angle (option C) is often regarded as safer. At this angle, for every 4 feet in ladder height, the base should be 1 foot out from the wall. This arrangement aims to provide stability and prevent the ladder from tipping over. Note that below or above this suggested angle, the ladder can either fall backward or slide out respectively, which could be unsafe.
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