After the United Kingdom began rolling out taxes equivalent to a few cents on single-use plastic grocery bags in 2011,
plastic-bag consumption decreased by up to ninety ______ taxes are subject to what economists call the “rebound effect”: as
the change became normalized, plastic-bag use started to creep back up.
percent, such
percent and such
percent. Such
percent such
Choice C is the best answer. The convention being tested is punctuation use between sentences. In this choice, the period
after “percent” is used correctly to mark the boundary between one sentence (“After…percent”) and another (“Such…up”).
Choice A is incorrect because it results in a comma splice. A comma can’t be used in this way to mark the boundary
between sentences. Choice B is incorrect. Without a comma preceding it, the conjunction “and” can’t be used in this way to
join sentences. Choice D is incorrect because it results in a run-on sentence. The sentences (“After…percent” and “Such…up”)
are fused without punctuation and/or a conjunction.