Astronomy current events question: the moon's Mafic Mound

Astronomy 210L, fall 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!)

Kevin Stacey, "Mound near Lunar South Pole Formed by Unique Volcanic Process" (October 15, 2015)
news.brown.edu/articles/2015/10/mound

Data from several different spacecraft provide evidence that the moon's South Pole-Aitken Basin may have had volcanic activity triggered by:
(A) moonquakes.
(B) flowing water.
(C) collapsing lava tubes.
(D) a colossal impact event.
(E) escaping radioactive gases.

Correct answer: (D)

Student responses
Sections 70178, 70186
(A) : 3 students
(B) : 0 students
(C) : 6 students
(D) : 18 students
(E) : 0 students