A government body officially known as the Althing, ______ blank Which choice completes the text so

Choice B is the best answer. The convention being tested is subject-modifier placement. This choice makes the noun phrase "Iceland’s parliament" the subject of the sentence and places it immediately after the modifying phrase "a government body officially known as the Althing." In doing so, this choice clearly establishes that Iceland’s parliament—and not another noun in the sentence—is the government body known as the Althing.

Choice A is incorrect because it results in a dangling modifier. The placement of the noun phrase "the world’s oldest parliaments" immediately after the modifying phrase illogically suggests that the world’s oldest parliaments are a government body known as the Althing. Choice C is incorrect because it results in a dangling modifier. The placement of the noun phrase "the first meeting" immediately after the modifying phrase illogically suggests that the first meeting of Iceland’s parliament was a government body known as the Althing. Choice D is incorrect because it results in a dangling modifier. The placement of the noun phrase "930 CE" immediately after the modifying phrase illogically suggests that the year 930 CE is a government body known as the Althing.