Astronomy current events question: finding particles collected by NASA Stardust

Astronomy 210L, spring semester 2014
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!)

Richard A. Kerr, "Spacecraft Returns Seven Particles From Birth of the Solar System," March 21, 2014
http://news.sciencemag.org/space/2014/03/spacecraft-returns-seven-particles-birth-solar-system

Interstellar dust particles in NASA's Stardust aerogel collector were located by:
(A) trained service dogs.
(B) "crowdsource" volunteers.
(C) automatic computer algorithms.
(D) washing down the spacecraft.
(E) radioactivity levels.

Correct answer: (B)

Student responses
Sections 30678, 30679, 30680, 30682
(A) : 1 student
(B) : 39 students
(C) : 10 students
(D) : 7 students
(E) : 6 students