Astronomy current events question: differentiation of Mars' terrain

Astronomy 210L, spring semester 2015
Cuesta College, San Luis Obispo, CA

Students are assigned to read online articles on current astronomy events, and take a short current events quiz during the first 10 minutes of lab. (This motivates students to show up promptly to lab, as the time cut-off for the quiz is strictly enforced!)

Peter Rüegg, "The Two Faces of Mars," (January 29, 2015)
http://www.ethz.ch/en/news-and-events/eth-news/news/2015/01/two-faces-of-mars.html

Mars' different terrain may be result of a moon-sized object crashing into its south pole, according to:
(A) circular mountain ranges.
(B) Mars rover Curiosity samples.
(C) computer simulations.
(D) samples from the south polar ice cap.
(E) radioactive dating of Mars' moons.

Correct answer: (C)

Student responses
Sections 30678, 30679, 30680
(A) : 10 students
(B) : 8 students
(C) : 25 students
(D) : 9 students
(E) : 3 students