Which of These Upcoming Observations Will Help Test the Idea

Which of these upcoming observations will help test the idea that Mars' atmosphere thinned due to interactions with the solar wind?

A) Geologists will measure the carbon content of Martian rocks that were transported to Earth by asteroid impacts.
B) The Curiosity rover will measure the carbon content of rocks on Mars' surface.
C) The upcoming MAVEN orbiter will measure present- day gas loss from Mars' atmosphere.
D) Astronomers will use spectrographs on the Keck telescope to measure the density of Mars' atmosphere.

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