Astronomy current events question: Chicxulub impact flood water fossils

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!)

Brendan M. Lynch, "Stunning Discovery Offers Glimpse of Minutes Following 'Dinosaur-Killer' Chicxulub Impact" (March 29, 2019)
news.ku.edu/2019/03/29/stunning-discovery-offers-glimpse-minutes-following-‘dinosaur-killer’-chicxulub-impact

Flood deposits in North Dakota from the asteroid impact that killed the dinosaurs were found to include a mixture of:
(A) plasma.
(B) heavy metals.
(C) greenhouse gases.
(D) radioactive minerals.
(E) fresh and saltwater fossils.

Correct answer: (E)

Student responses
Sections 30679, 30680
(A) : 0 students
(B) : 4 students
(C) : 1 student
(D) : 9 students
(E) : 29 students