Astronomy current events question: Kepler-69e and Kepler 69f

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!)

Michele Johnson and J. D. Harrington, "NASA's Kepler Discovers Its Smallest 'Habitable Zone' Planets to Date," April 18, 2013
http://www.nasa.gov/mission_pages/kepler/news/kepler-62-kepler-69.html

NASA's Kepler space telescope discovered three super-Earth planets which may have oceans, as determined by their:
(A) lack of microwave emissions.
(B) reflectivity.
(C) distances from their stars.
(D) colors.
(E) infrared absorption.

Correct answer: (C)

Student responses
Sections 30678, 30679, 30680
(A) : 1 student
(B) : 7 students
(C) : 32 students
(D) : 2 students
(E) : 6 students