According to general safety guidelines, when setting up an extension ladder, what is the recommended ratio of the ladder's height to its distance from the wall at the base?

✓ Correct Answer: Option C

The 4-to-1 rule (or 1-to-4 rule) states that for every four feet of ladder height, the base of the ladder should be one foot away from the wall. This angle provides maximum stability and minimizes the risk of the ladder sliding out or tipping over.