Astronomy current events question: impact origin of lunar Procellarum basin?

Astronomy 210L, fall semester 2012
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!)

Bob Yirka, "Researchers Find Evidence That Moon's Procellarum Basin Formed By Asteroid Strike," October 31, 2012
http://phys.org/news/2012-10-evidence-moon-procellarum-basin-asteroid.html

Researchers from the National Institute of Advanced Industrial Science and Technology (AIST) in Japan have proposed that the moon's Procellarum basin was formed from a giant asteroid impact based on:
(A) analysis of moonquakes.
(B) fault line patterns.
(C) Apollo moon landing rock samples.
(D) light reflected by surface minerals.
(E) high-resolution radar images.

Correct answer: (D)

Student responses
Sections 70178, 70186, 70200
(A) : 6 students
(B) : 8 students
(C) : 10 students
(D) : 15 students
(E) : 11 students