Astronomy current events question: Edgeworth-Kuiper belt object occultation

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!)

News release, "Missing-Link in Planet Evolution Found" (January 29, 2019)
nao.ac.jp/en/news/science/2019/20190129-kbo.html

The OASES (Organized Autotelescopes for Serendipitous Event Survey) telescopes detected a small 1.3 km radius Edgeworth-Kuiper belt object as it:
(A) collided with Pluto.
(B) nearly impacted Earth.
(C) passed in front of a star.
(D) began its cometary phase.
(E) escaped from the solar system.

Correct answer: (C)

Student responses
Sections 30679, 30680
(A) : 6 students
(B) : 1 students
(C) : 20 students
(D) : 9 students
(E) : 7 students