Astronomy current events question: Pluto's "penitentes" spikes

Astronomy 210L, spring semester 2017
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!)

Anjum Nayyar, "York U Research Identifies Icy Ridges on Pluto?" (January 4, 2017)
news.yorku.ca/2017/01/04/york-u-research-identifies-icy-ridges-on-pluto/

Pluto may have gigantic ice "penitentes" spikes on its surface, based on computer simulations of evaporating ice, and analysis of:
(A) drone footage.
(B) soil samples.
(C) horizon panoramas.
(D) Pluto's surface reflectivity.
(E) similar conditions on Earth.

Correct answer: (E)

Student responses
Sections 30679, 30680
(A) : 4 students
(B) : 2 students
(C) : 0 students
(D) : 14 students
(E) : 16 students