Astronomy current events question: M60-UCD1 dwarf galaxy supermassive black hole

Astronomy 210L, fall semester 2014
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!)

Felicia Chou, Donna Weaver, and Ray Villard, "Hubble Helps Find Smallest Known Galaxy Containing a Supermassive Black Hole," (September 17, 2014)
http://www.nasa.gov/press/2014/september/hubble-helps-find-smallest-known-galaxy-containing-a-supermassive-black-hole/index.html

The Hubble Space Telescope and the Gemini North telescope on Mauna Kea observed __________ near the center of the M60-UCD1 dwarf galaxy, indicating the presence of a supermassive black hole.
(A) star motions.
(B) the lack of light.
(C) gravitational lensing.
(D) gamma-ray bursts.
(E) dark matter.

Correct answer: (A)

Student responses
Sections 70178, 70186
(A) : 5 students
(B) : 19 students
(C) : 2 students
(D) : 3 students
(E) : 12 students