Astronomy current events question: multiple Sunburst Arc galaxy images

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!)

Martina d'Angelo, "Astronomers Observe a Sunburst from the Early Universe--in 12 Copies" (November 8, 2019)
titan.uio.no/node/3518

Multiple zoomed-in images of early star formation in the Sunburst Arc galaxy were produced by:
(A) antimatter fields.
(B) neutrino emissions.
(C) gravitational lensing.
(D) radio interferometry.
(E) scanning old photographic plates.

Correct answer: (C)

Student responses
Sections 70178, 70186
(A) : 1 student
(B) : 9 students
(C) : 16 students
(D) : 4 students
(E) : 3 students