Astronomy current events question: red spots on Charon

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!)

Nola Taylor Redd, "Weird Red Spot on Pluto's Moon Charon Caused by Traveling Atmosphere" (September 14, 2016)
space.com/34066-pluto-moon-charon-red-spot-source.html

Computer models suggest that the red spot on the north pole of Pluto's moon, Charon, may be organic molecules from Pluto's:
(A) cryovolcanoes.
(B) atmosphere.
(C) ancient lifeforms.
(D) rings.
(E) magnetic fields.

Correct answer: (B)

Student responses
Sections 70178, 70186
(A) : 4 students
(B) : 23 students
(C) : 0 students
(D) : 0 students
(E) : 0 students