The best place to use your cruise control is:
D. Rural interstate highways
Cruise control is most effective and safe on long, open stretches of highway where traffic is minimal and speeds are consistent. This allows for a more relaxed driving experience and can help maintain fuel efficiency. It's less appropriate in busy city streets (A), urban freeways (B), or two-lane rural driving (C), where there are more frequent stops, changes in speed, and the need for greater driver engagement.