Astronomy current events question: VLA detecting distant galaxy radio sources

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!)

Dave Finley, "VLA Gives Deep, Detailed Image of Distant Universe," April 30, 2013
http://www.nrao.edu/pr/2013/vladeep/

Astronomers using data from the Very Large Array radio telescopes determined that background radio emissions from distant galaxies are mainly from:
(A) massive central black holes.
(B) dark matter.
(C) dark energy.
(D) very cold hydrogen clouds.
(E) gravity waves.

Correct answer: (A)

Student responses
Sections 30678, 30679, 30680
(A) : 12 students
(B) : 10 students
(C) : 1 student
(D) : 1 student
(E) : 7 students