In 1959, marine biologist Dr. Albert Jones founded the Underwater Adventure Seekers, a scuba diving ______ that is the
oldest club for Black divers in the United States and that has helped thousands of diving enthusiasts become certiﬁed in the
ﬁeld.
club
club,
club—
club, and
Choice A is the best answer. “That is…ﬁeld” is an essential supplement, so we should not use punctuation to separate it from
“scuba diving club.” .
Choice B is incorrect. This choice creates a punctuation error. “That is…ﬁeld” is an essential supplement, so we should not
use a comma (or any kind of punctuation) to separate it from “scuba diving club.” . Choice C is incorrect. This choice creates
a punctuation error. “That is…ﬁeld” is an essential supplement, so we should not use a dash (or any kind of punctuation) to
separate it from “scuba diving club.” . Choice D is incorrect. This choice creates a run-on sentence. It makes “that is…United
States” into an awkward independent clause, but it also makes “that has…ﬁeld” into its own awkward independent clause
without the correct punctuation separating it.