Astronomy current events question: multiple galaxies hidden within hot glowing dust

Astronomy 210L, spring semester 2016
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!)

Jacqui Bealing, "Bright Dusty Galaxies are Hiding Secret Companions" (May 6, 2016)
sussex.ac.uk/broadcast/read/35494

Based on __________, several hidden galaxies may be responsible for the glowing dust surrounding a bright galaxy.
(A) statistical methods.
(B) x-ray beams.
(C) ultraviolet observations.
(D) radar reflections.
(E) gravitational waves.

Correct answer: (A)

Student responses
Sections 30678, 30679, 30680
(A) : 3 students
(B) : 0 students
(C) : 4 students
(D) : 3 students
(E) : 3 students