Which of the following rules should be used to keep the appropriate distance between your vehicle and the vehicle in front of you?

Generally, you should leave about 3 seconds worth of your current speed's distance ahead of you. For example, if you were traveling at 55mph, you would be going at about 81 feet per second. That means you should leave approximately 243 feet between yourself and the vehicle in front of you.

Answer is d. staying organized

The earth's inner core is the earth's innermost part. it is primarily a solid ball with a radius of about 1,220 km (760 miles), which is about 70% of the moon's radius.[1][2] it is composed of an iron–nickel alloy and some light elements. the temperature at the inner core's surface is approximately 5,700 k (5,430 °c), which is about the temperature at the surface of the sun.