Astronomy current events question: "sideline" quasars

Astronomy 210L, spring semester 2013
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!)

Michael Shull and Jim Scott, "'Sideline Quasars' Helped to Stifle Early Galaxy Formation, says CU Study," March 21, 2013
http://www.colorado.edu/news/releases/2013/03/21/%E2%80%98sideline-quasars%E2%80%99-helped-stifle-early-galaxy-formation-says-cu-study

University of Colorado researchers studied quasar light passing through gaseous material in space, and propose that quasars __________ in the early universe.
(A) slowed the rate of expansion.
(B) produced antimatter.
(C) created helium.
(D) destroyed black holes.
(E) prevented small galaxy formation.

Correct answer: (E)

Student responses
Sections 30678, 30679, 30680
(A) : 8 students
(B) : 0 students
(C) : 13 students
(D) : 3 students
(E) : 40 students