How far in advance must you signal before making a left turn?

Answer: C — 100 feet

When preparing to make a left turn, it is essential to signal well in advance to alert other drivers and pedestrians of your intentions. Signaling 100 feet before the turn provides sufficient notice to those around you, allowing for safer roadway conditions. It gives other drivers time to react appropriately and ensures that pedestrians can clear the intersection safely. Choosing a distance shorter than 100 feet might not provide adequate warning, potentially resulting in confusion or accidents, while signaling farther than 100 feet may not significantly enhance safety and could be less practical in certain driving situations. Therefore, the requirement of signaling at least 100 feet before making a left turn is a crucial rule for safe driving practices in Montana.