Final answer:
Turn signals should be used to indicate an intention to turn or change lanes, and it is typically required to activate them at least 100 feet before doing so in urban or residential areas, although this can vary by jurisdiction. the correct option is (a).
Step-by-step explanation:
Turn signals should be used to indicate your intention to turn or change lanes to other drivers. The recommended distance to activate your turn signal before turning or changing lanes is typically specified by the local traffic laws. While specific distances can vary by jurisdiction, a common statute is to signal at least 100 feet before turning or changing lanes in urban or residential areas.
It's important to consider the speed of the vehicle and the road conditions when signaling. For example, if you're driving on a highway at a higher speed, you may need to signal earlier than 100 feet to ensure other drivers have ample notice of your intentions. Additionally, signaling early promotes safety and can help reduce the likelihood of accidents, as other drivers can prepare for your maneuver.