Astronomy current events question: "super fast" galaxy rotation curves

Astronomy 210L, fall semester 2019
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!)

Patrick Ogle, "SALT Observes Super Fast Spirals!" (October 17, 2019)
salt.ac.za/news/salt-observes-super-fast-spirals/

Southern African Large Telescope measurements of "super spiral" galaxy rotation rates provide evidence of gravity produced by:
(A) neutrino streams.
(B) antimatter clouds.
(C) dark matter halos.
(D) active galactic nuclei.
(E) non-Newtonian dynamics.

Correct answer: (C)

Student responses
Sections 70178, 70186
(A) : 1 student
(B) : 1 student
(C) : 26 students
(D) : 3 students
(E) : 2 students