Which of the Following Is Not an Advantage of Spacecraft

Multiple Choice

Which of the following is not an advantage of spacecraft flybys over ground-based telescope observations?

A) Spacecraft can sample the gravitational field of a planet.
B) Spacecraft can view "backlit" views of planetary rings.
C) Spacecraft can measure local magnetic fields.
D) Spacecraft can monitor changes in a planet's atmosphere over long times.
E) Spacecraft can make highly detailed images of the planet and its moons.