Astronomy current events question: Indonesian atmospheric blast

Astronomy 210L, Fall Semester 2009
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!)

Kelly Beatty, "Cosmic Blast Rattles Indonesia," October 25, 2009
http://www.skyandtelescope.com/community/skyblog/newsblog/65960457.html

What have scientists determined to be most likely cause of an atmospheric blast over Indonesia in early October?
(A) Asteroid fragment.
(B) Stray antimatter particles.
(C) Gamma ray burst.
(D) The Large Hadron Collider in Switzerland.
(E) Reentering rocket booster.

Correct answer: (A)

Student responses
Section 70200
(A) : 20 students
(B) : 1 student
(C) : 2 students
(D) : 0 students
(E) : 0 students