Astronomy current events question: youngest galaxy

Astronomy 210L, Spring Semester 2011
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!)

Whitney Clavin, Ray Villard, Larry O'Hanlon, "NASA Telescopes Help Discover Surprisingly Young Galaxy," April 12, 2011
http://www.nasa.gov/mission_pages/spitzer/news/spitzer20110412.html

Observation of the youngest galaxy in the universe by NASA's Hubble Space Telescope and other space-based and ground-based telescopes was assisted by:
(A) deep underground neutrino detectors.
(B) new detectors on the International Space Station.
(C) using a ground-based laser to clear hydrogen fog.
(D) gravitational lensing by galaxy clusters in front of it.
(E) optical interferometry, to boost resolving power.

Correct answer: (D)

Student responses
Sections 30678, 30679, 30680
(A) : 1 student
(B) : 6 students
(C) : 7 students
(D) : 26 students
(E) : 9 students