Astronomy current events question: Chang'e 3 probe of underground lunar lava layers

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!)

Kelly Beatty, "Lots of Lunar Layers Under Chang’e 3" (March 13, 2015)
http://www.skyandtelescope.com/astronomy-news/change-3-lunar-layers-031320154/

The Chinese National Space Administration moon rover Yutu studied underground lava flow layers using:
(A) chemical ablation lasers.
(B) ground-penetrating radar.
(C) a remote digger.
(D) infrared cameras.
(E) GPS triangulation.

Correct answer: (B)

Student responses
Sections 30678, 30679, 30680
(A) : 3 students
(B) : 22 students
(C) : 1 student
(D) : 8 students
(E) : 1 student