Which of the following statements best describes mountains and hills? A. “Hill” and “mountain” mean the same thing. B. Whether a landform is a hill or mountain is subjective; one person might call a certain landform a hill, and someone else might call it a mountain. C. A hill is defined as a rise that is less than 1,000 feet, and a mountain is anything over 1,000 feet. D. A mountain is defined as any rise over 5,000 feet, and any rise below that elevation is called a hill.