Astronomy current events question: Enceladus' hydrothermal vents

Astronomy 210L, spring semester 2015
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!)

Dwayne Brown and Preston Dyches, "Spacecraft Data Suggest Saturn Moon's Ocean May Harbor Hydrothermal Activity" (March 11, 2015)
https://www.nasa.gov/press/2015/march/spacecraft-data-suggest-saturn-moons-ocean-may-harbor-hydrothermal-activity/

__________ detected by NASA's Cassini spacecraft provide evidence of active hydrothermal vents on Enceladus, Saturn's moon.
(A) Infrared emissions.
(B) Sulfur plumes.
(C) Magnetic field fluctuations.
(D) Moonquakes.
(E) Microscope rock grains.

Correct answer: (E)

Student responses
Sections 30678, 30679, 30680
(A) : 7 students
(B) : 7 students
(C) : 5 students
(D) : 1 student
(E) : 15 students