Astronomy current events question: Pluto's hidden ocean?

Astronomy 210L, fall semester 2011
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!)

Nola Taylor Redd, "Pluto's Hidden Ocean," November 17, 2011
http://www.astrobio.net/exclusive/4343/plutos-hidden-ocean-

When NASA's New Horizons spacecraft passes by Pluto in 2015, it is expected to verify whether or not there is a subsurface ocean by looking at Pluto's:
(A) surface contours.
(B) geyser outflow composition.
(C) habitable zone.
(D) crater density.
(E) atmosphere composition.

Correct answer: (A)

Student responses
Sections 70178, 70186, 70200
(A) : 14 students
(B) : 3 students
(C) : 2 students
(D) : 2 students
(E) : 3 students