Astronomy current events question: more Earth-like planets to form?

Astronomy 210L, fall semester 2015
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!)

Donna Weaver, Ray Villard, Felicia Chou, Peter Behroozi, Molly Peeples, "Most Earth-Like Worlds Have Yet to Be Born, According to Theoretical Study" (October 20, 2015)
hubblesite.org/newscenter/archive/releases/2015/35/full/

NASA's Hubble Space Telescope and Kepler mission observations of hydrogen and star-formation rates from the past and present-day provide evidence that:
(A) black holes should eventually dominate.
(B) many more Earth-like planets could form in the future.
(C) life on Earth cannot spread to other planets.
(D) the universe will continue to expand without end.
(E) dark matter exists.

Correct answer: (B)

Student responses
Section 70178
(A) : 1 student
(B) : 19 students
(C) : 0 students
(D) : 3 students
(E) : 1 student