Astronomy current events question: organic compounds on Ceres' surface

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!)

Elizabeth Landau, "Dawn Discovers Evidence for Organic Material on Ceres" (February 16, 2017)
jpl.nasa.gov/news/news.php?feature=6751

NASA's Dawn spacecraft found evidence of organic compounds on the surface of the dwarf planet Ceres, by observing:
(A) reflected infrared light.
(B) geological hot spots.
(C) ice geyser eruptions.
(D) escaping gases.
(E) fossil remains.

Correct answer: (A)

Student responses
Sections 30679, 30680
(A) : 14 students
(B) : 7 students
(C) : 3 students
(D) : 3 students
(E) : 1 student