Which of the Following Is NOT a Way We Have

Multiple Choice

Which of the following is NOT a way we have studied the planet Mars so far?

A) observing it through telescopes from Earth
B) sending a spacecraft into orbit around it
C) landing a spacecraft on the surface and examining the soil in an automated laboratory
D) studying samples of Mars that were blasted off Mars by impacts long ago, and found later on Earth
E) sending spacecraft to Mars which have brought samples of the planet back to Earth