Astronomy current events question: Saturn's rings coating its moons

Astronomy 210L, spring 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!)

Gretchen McCartney and JoAnna Wendel, "NASA's Cassini Finds Saturn's Rings Coat Tiny Moons" (March 28, 2019)
jpl.nasa.gov/news/news.php?release=2019-051&rn=news.xml&rst=7360

Data collected by NASA's Cassini spacecraft indicate that material covering the surfaces of Saturn's moons may come from:
(A) solar winds.
(B) Saturn's rings.
(C) comet impacts.
(D) the asteroid belt.
(E) hydrocarbon rain.

Correct answer: (B)

Student responses
Sections 30679, 30680
(A) : 3 students
(B) : 25 students
(C) : 3 students
(D) : 2 students
(E) : 3 students