Astronomy current events question: galaxy F01004-2237 supermassive black hole

Astronomy 210L, spring semester 2017
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!)

Amy Pullan, "Stars Regularly Ripped Apart by Black Holes in Colliding Galaxies" (February 27, 2017)
sheffield.ac.uk/news/nr/stars-ripped-apart-black-holes-1.684679

Observations of the F01004-2237 galaxy's supermassive black hole's ___________ as it ripped apart a nearby star suggest that such events may be very common.
(A) Doppler shifts.
(B) gravitational wobbles.
(C) magnetic field.
(D) brightness fluctuations.
(E) absorbed light wavelengths.

Correct answer: (D)

Student responses
Sections 30679, 30680
(A) : 3 students
(B) : 5 students
(C) : 3 students
(D) : 15 students
(E) : 6 students