Astronomy current events question: "brown barge" on Jupiter

Astronomy 210L, fall semester 2018
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!)

Tony Greicius, "Juno Captures Elusive 'Brown Barge'" (September 14, 2018)
nasa.gov/image-feature/jpl/juno-captures-elusive-brown-barge

NASA's Juno spacecraft recently imaged a "brown barge" in Jupiter's atmosphere, which is a(n):
(A) break in the cloud cover.
(B) eclipse shadow from one of its moons.
(C) temporarily-captured asteroid.
(D) cyclonic cloud region.
(E) ammonia lightning storm.

Correct answer: (D)

Student responses
Sections 70178, 70186
(A) : 3 students
(B) : 0 students
(C) : 2 students
(D) : 14 students
(E) : 2 students