Astronomy current events question: recent ages of Mars' lakes

Astronomy 210L, fall semester 2016
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!)

Guy Webster, Dwayne Brown, and Laurie Castillo, "Some Ancient Mars Lakes Came Long After Others" (September 15, 2016)
jpl.nasa.gov/news/news.php?feature=6619

Some ancient lakes on Mars may have formed relatively recently, as determined by comparing inlet valley features with the ages of overlapping:
(A) glaciers.
(B) lava flows.
(C) sedimentary layers.
(D) rift zones.
(E) impact craters.

Correct answer: (E)

Student responses
Sections 70178, 70186
(A) : 2 students
(B) : 2 students
(C) : 13 students
(D) : 2 students
(E) : 8 students