Astronomy current events question: Uranus' Trojan asteroid 2011 QF99

Astronomy 210L, fall 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!)

Charles Q. Choi, "'Trojan Asteroid' Discovered Forming Triangle with Sun, Uranus," August 29, 2013
http://www.nbcnews.com/science/trojan-asteroid-discovered-forming-triangle-sun-uranus-8C11036226

Astronomers at the Canada-France-Hawaii Telescope have discovered asteroid 2011 QF99, which is said to be a Trojan asteroid because it:
(A) is an escaped moon of Uranus.
(B) will collide with Uranus.
(C) shares Uranus' orbit around the sun.
(D) is opposite the sun from Uranus.
(E) has an unusually high metal content.

Correct answer: (C)

Student responses
Sections 70178, 70186, 70200
(A) : 4 students
(B) : 3 students
(C) : 39 students
(D) : 5 students
(E) : 8 students