Astronomy current events question: Io's volcano locations

Astronomy 210L, spring 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!)

Jia-Rui C. Cook, Nancy Neal-Jones, Bill Steigerwald, "Scientists to Io: Volcanoes are in the Wrong Spot," April 4, 2013
http://www.jpl.nasa.gov/news/news.php?release=2013-125

According to NASA and European Space Agency researchers, __________ on Jupiter's moon, Io, are displaced from positions expected from tidal heating.
(A) hydrocarbon lakes.
(B) polar ice caps.
(C) lightning storms.
(D) volcanoes.
(E) subduction zones.

Correct answer: (D)

Student responses
Sections 30678, 30679, 30680
(A) : 2 students
(B) : 1 student
(C) : 0 student
(D) : 49 students
(E) : 1 student