Astronomy current events question: electrical hazards on Phobos, Deimos?

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!)

Bill Steigerwald, Nancy Jones, "Solar Eruptions Could Electrify Martian Moons" (October 18, 2017)
nasa.gov/press-release/goddard/2017/mars-electric-moons

Future rover or astronaut missions to Mars' moons Phobos and Deimos may encounter hazardous electrical conditions caused by:
(A) radioactivity.
(B) Mars' magnetic field.
(C) micrometeorite erosion.
(D) the solar wind.
(E) tidal heating.

Correct answer: (D)

Student responses
Sections 70178, 70186
(A) : 3 students
(B) : 2 students
(C) : 7 students
(D) : 34 students
(E) : 0 students