Astronomy current events question: galaxy RCS2 032727-132623 magnification

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!)

Ray Villard and Jane Rigby, "Hubble Zooms in on a Magnified Galaxy," February 2, 2012
http://www.nasa.gov/mission_pages/hubble/science/magnified-galaxy.html

The extremely distant galaxy RCS2 032727-132623 appears magnified when viewed by NASA's Hubble Space Telescope because of:
(A) magnetic interference from solar flares.
(B) gravitational lensing from a nearby galaxy.
(C) extreme blueshifted light.
(D) a recent software upgrade.
(E) a new lens attachment.

Correct answer: (B)

Student responses
Sections 30678, 30679, 30680
(A) : 8 students
(B) : 8 students
(C) : 3 students
(D) : 1 student
(E) : 6 students