Astronomy current events question: KIC 05807616 planets

Astronomy 210L, spring semester 2012
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!)

Astronomy.com editors, "Astronomers Discover Two Planets That Survived Their Star's Expansion," December 22, 2011
http://astronomy.com/en/News-Observing/News/2011/12/Astronomers%20discover%20two%20planets%20that%20survived%20their%20stars%20expansion.aspx

Two planets that apparently survived being engulfed by their bloated, dying parent star KIC 05807616 were discovered by NASA's Kepler space telescope from:
(A) light reflected or emitted by the planets.
(B) radar pulse timing variations.
(C) star wobbles detected by ground-based telescopes.
(D) asteroid fragment trails.
(E) reformation of their cores.

Correct answer: (A)

Student responses
Sections 30678, 30679, 30680
(A) : 18 students
(B) : 5 students
(C) : 2 students
(D) : 4 students
(E) : 3 students