Astronomy current events question: exoplanet GJ1214b water-rich atmosphere?

Astronomy 210L, fall semester 2013
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!)

SciTechDaily staff, "Observations Indicate Super-Earth GJ 1214 b Has a Water-Rich Atmosphere," September 4, 2013
http://scitechdaily.com/observations-indicate-super-earth-gj-1214-b-water-rich-atmosphere/

Subaru Telescope observations of __________ indicate exoplanet GJ 1214 b may have a water-rich atmosphere.
(A) scattered light.
(B) glowing clouds.
(C) Doppler blue-shifts.
(D) glacier ice.
(E) chlorophyll compounds.

Correct answer: (A)

Student responses
Sections 70178, 70186, 70200
(A) : 25 students
(B) : 6 students
(C) : 20 students
(D) : 7 students
(E) : 1 student