Astronomy current events question: gigantic ring system around star J1407

Astronomy 210L, spring semester 2015
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!)

Leonor Sierra, "Gigantic Ring System around J1407b Much Larger, Heavier than Saturn’s," (January 26, 2015)
http://www.rochester.edu/newscenter/gigantic-ring-system-around-j1407b/

The gigantic ring system surrounding sun-like star J1407 was discovered by analyzing changes in brightness as the rings __________ the star.
(A) are vaporized by.
(B) slowly fall in towards.
(C) form exomoons around.
(D) pass in front of.
(E) are flung outwards from.

Correct answer: (D)

Student responses
Sections 30678, 30679, 30680
(A) : 4 students
(B) : 4 students
(C) : 14 students
(D) : 26 students
(E) : 3 students