Astronomy current events question: Mistastin Lake crater impact event temperatures

Astronomy 210L, fall semester 2017
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!)

Aylin Woodward, "The Hottest Place Ever Recorded on Earth's Surface Was 2370°C" (September 13, 2017)
newscientist.com/article/mg23531433-600-found-the-hottest-place-ever-found-on-earths-surface/

Based on analysis of __________, an impact crater in Canada 40 million years ago generated the hottest temperatures experienced on Earth's surface.
(A) embedded gas bubbles in rocks.
(B) radioactive minerals.
(C) dried-out lake beds.
(D) dinosaur fossil DNA.
(E) semi-precious gemstones.

Correct answer: (E)

Student responses
Sections 70178, 70186
(A) : 1 student
(B) : 0 students
(C) : 2 students
(D) : 1 student
(E) : 34 students