Astronomy current events question: planet 2MASS J2126 and brown dwarf star TYC 9486-927-1

Astronomy 210L, spring semester 2016
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!)

Niall Deacon and Joshua E. Schlieder, "1 Trillion Kilometres Apart: a Lonely Planet and its Distant Star" (January 26, 2016)
ras.org.uk/news-and-press/news-archive/264-news-2016/2770-1-trillion-kilometres-apart-a-lonely-planet-and-its-distant-star

The planet 2MASS J2126 is in an extremely wide orbit around brown dwarf star TYC 9486-927-1, based on their shared:
(A) rotation rates.
(B) chemical composition.
(C) distances and motions.
(D) brightnesses and colors.
(E) pulsation periods.

Correct answer: (C)

Student responses
Sections 30678, 30679, 30680
(A) : 9 students
(B) : 4 students
(C) : 26 students
(D) : 2 students
(E) : 2 students