How far in advance of a turn must you signal your intention to turn?

Answer: C — 20 feet

The requirement to signal your intention to turn is in place to ensure safety and clear communication with other road users. Signaling at least 100 feet before making a turn provides adequate time for other drivers and pedestrians to be aware of your intentions, thereby reducing the risk of accidents. Although some may think that signaling only 20 feet in advance is sufficient, this distance does not give enough warning for others to act accordingly. It's crucial for drivers to give sufficient notice to allow other road users to prepare for the change in traffic flow. The 100-foot rule is a standard guideline that ensures safety while maintaining smooth traffic operations.