Always support and protect ladders from:

Supporting and protecting ladders from environmental factors such as rain, wind, and sunlight is crucial for ensuring their stability and longevity. When ladders are exposed to rain, they can become slippery, increasing the risk of falls or accidents during use. Additionally, wind can create instability, particularly with lightweight ladders that can be easily tipped or blown over, posing a serious hazard to users.

Sunlight can also have detrimental effects on ladders, especially those made from materials like plastic or certain types of wood, which can become warped or weakened over time due to UV exposure. This degradation can compromise the ladder's structural integrity, making it less safe to use.

By acknowledging that all these elements can affect ladder safety, the correct answer emphasizes the importance of employing protective measures against every potential risk factor. Thus, it's essential to support and protect ladders from all of the mentioned environmental conditions.