Astronomy current events question: Mars' giant impact tsunamis

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!)

Mike Wall, "This Impact Crater Was Likely Ground Zero for an Ancient Mega-Tsunami on Mars" (August 5, 2019)
space.com/mars-ocean-mega-tsunami-impact-crater.html/

Analysis of geological formations on Mars' ancient shorelines provide evidence of two separate tsunami events created by:
(A) massive landslides.
(B) marsquake tremors.
(C) giant meteor impacts.
(D) supervolcano eruptions.
(E) collapsing continental plates.

Correct answer: (C)

Student responses
Sections 70178, 70186
(A) : 2 students
(B) : 13 students
(C) : 22 students
(D) : 5 students
(E) : 1 student