Astronomy current events question: Abell 383 dark matter

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!)

Janet Anderson, Megan Watzke, "Abell 383: An Elusive Subject," March 14, 2012
http://www.nasa.gov/mission_pages/chandra/multimedia/abell383.html

Scientists are using gravitational lensing in galaxy cluster Abell 383 images to analyze the presence of its:
(A) zodiacal light.
(B) central supermassive black hole.
(C) emission and reflection nebulae.
(D) white dwarfs.
(E) dark matter.

Correct answer: (E)

Student responses
Sections 30678, 30679, 30680
(A) : 2 students
(B) : 2 students
(C) : 0 students
(D) : 1 student
(E) : 22 students