15. An airplane flies 3,000 feet over Elmer's property. Elmer sues the airline, claiming that trespass has occurred. Which of the following statements is true?

A. Trespass hasn't occurred because no one stepped on ground owned by Elmer.

B. Trespass has occurred because Elmer owns the air up to 5,000 feet.

C. Trespass hasn't occurred because the plane was 3,000 feet high.

D. If the airplane was visible from Elmer's property, trespass has occurred.