Astronomy current events question: red dwarf "super-flare"

Astronomy 210L, spring semester 2020
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!)

Gianrico Filacchione, Beate Stelzer, Andrea De Luca, and Norbert Schartel, "XMM-Newton Reveals Giant Flare from a Tiny Star" (February 20, 2020)
esa.int/Science_Exploration/Space_Science/XMM-Newton_reveals_giant_flare_from_a_tiny_star

The European Space Agency's XMM-Newton X-ray space telescope detected a "super-flare" of x-rays released from the collapsing magnetic fields of a:
(A) pulsar.
(B) sunspot.
(C) red dwarf.
(D) black hole.
(E) supergiant.

Correct answer: (C)

Student responses
Sections 30679, 30680
(A) : 2 students
(B) : 1 student
(C) : 27 students
(D) : 0 students
(E) : 2 students