Astronomy current events question: decline dinosaurs and rise of deciduous trees

Astronomy 210L, fall semester 2014
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!)

Daniel Stolte, "Meteorite That Doomed Dinosaurs Remade Forests," (September 16, 2014)
http://uanews.org/story/meteorite-that-doomed-dinosaurs-remade-forests

University of Arizona scientists proposed fossilized __________ may be evidence that the rise of trees that change color in the fall may have been caused by the asteroid associated with the extinction of dinosaurs.
(A) pollen.
(B) dinosaur stomachs.
(C) leaves.
(D) bees.
(E) mammal teeth.

Correct answer: (C)

Student responses
Sections 70178, 70186
(A) : 5 students
(B) : 2 students
(C) : 34 students
(D) : 0 students
(E) : 0 students