Astronomy current events question: Ceres' bright spots evaporating?

Astronomy 210L, spring 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!)
Paolo Molaro and Richard Hook, "Unexpected Changes of Bright Spots on Ceres Discovered" (March 16, 2016)
Dwarf planet Ceres' surface spots may be evaporating in sunlight as it rotates, based on European Southern Observatory telescope observations of:
(A) snow avalanches.
(B) cloud formation.
(C) brightness variations.
(D) water vapor geysers.
(E) liquid water reflections.

Correct answer: (C)

Student responses
Sections 30678, 30679, 30680
(A) : 1 student
(B) : 6 students
(C) : 24 students
(D) : 3 students
(E) : 6 students

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