Astronomy current events question: James Webb Space Telescope launch delay

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!)

Brian Dunbar, "NASA’s James Webb Space Telescope to be Launched Spring 2019" (September 28, 2017)
nasa.gov/feature/nasa-s-james-webb-space-telescope-to-be-launched-spring-2019

The launch for NASA's James Webb Space Telescope has been pushed back six months to early 2019, due to:
(A) launch pad hurricane damage.
(B) expected peak sunspot activity.
(C) additional assembly and testing time.
(D) SpaceX rocket availability.
(E) plutonium fuel pellet shortages.

Correct answer: (C)

Student responses
Sections 70178, 70186
(A) : 1 student
(B) : 4 students
(C) : 32 students
(D) : 1 student
(E) : 0 students