Astronomy current events question: life in Venus' dark clouds?

Astronomy 210L, spring semester 2018
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!)

Terry Devitt, "Is There Life Adrift in the Clouds of Venus?" (March 30, 2018)
news.wisc.edu/is-there-life-adrift-in-the-clouds-of-venus/

Researchers propose that dark patches in Venus' atmosphere could be caused by __________ in its clouds.
(A) hydrocarbon hurricanes.
(B) black lightning.
(C) floating microbial life.
(D) sulfuric acid rain.
(E) volcanic outgassing.

Correct answer: (C)

Student responses
Sections 30679, 30680
(A) : 0 students
(B) : 0 students
(C) : 26 students
(D) : 6 students
(E) : 7 students