Astronomy current events question: exoplanet Ross 128 b orbiting quiet red dwarf star

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!)

Xavier Bonfils, Nicola Astudillo-Defru, and Richard Hook, "Closest Temperate World Orbiting Quiet Star Discovered" (November 15, 2017)
eso.org/public/news/eso1736/

Exoplanet Ross 128 b is considered to be more likely to sustain life than Proxima b, as Ross 128 b orbits a red dwarf that has:
(A) quieter flare activity.
(B) stronger magnetic fields.
(C) more gravity.
(D) more metals.
(E) a cooler habitable zone.

Correct answer: (A)

Student responses
Sections 70178, 70186
(A) : 17 students
(B) : 2 students
(C) : 3 students
(D) : 1 student
(E) : 15 students