Astronomy current events question: LL Pegasi spiral gas pattern

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!)

Stuart Wolpert, "Using a Powerful Telescope, Scientists View Spiral Pattern of Gaseous Emissions around LL Pegasi and Its Companion Star" (March 16, 2017)
newsroom.ucla.edu/releases/astronomers-observe-a-dying-red-giant-stars-final-act

A 3-D map of the spiral pattern of gases surrounding the red giant and companion star in the LL Pegasi system was made from __________ observations by the Atacama Large Millimeter/submillimeter Array in Chile.
(A) radio wavelength.
(B) magnetic field.
(C) gravitational wave.
(D) neutrino emission.
(E) gamma ray.

Correct answer: (A)

Student responses
Sections 30679, 30680
(A) : 13 students
(B) : 0 students
(C) : 8 students
(D) : 4 students
(E) : 5 students