What is the main cause of rear-end collision accidents?

What is the main cause of rear-end collision accidents?
A)Abnormally low speeds.
B)Speeds exceeding 100 km per hour.
C)Failing to maintain a safe following distance from the vehicle travelling ahead.Correct
You must always maintain a safe following distance from the vehicle ahead such that, should its driver brake suddenly, you have sufficient time and space to react, brake and avoid a rear-end collision.