|Question 5Verbal

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Text
Spoken in Northern California, Karuk is an isolate, or a language that has no demonstrated relationship to other documented languages. The Haida language in Alaska is an isolate as well. However, most Native languages belong to language families, or groups of languages whose similarities can be attributed to shared descent from a single language spoken thousands of years ago. Curiously, isolates are more prevalent in regions where numerous nonisolates are also spoken. Thus, the geographical circumstances that favor the development of isolates may also drive diversification within language families.
Which choice best describes the overall structure of the text?
It provides examples of isolates, distinguishes isolates from most other Native languages, then discusses a point of correspondence between isolates and nonisolates.
A
It compares two isolates, sketches the process by which nonisolates evolve from isolates, then discusses how geography affects the development of isolates and nonisolates alike.
B
It defines the concepts of isolate languages and nonisolate languages, distinguishes between the regions where isolates and nonisolates are found, then accounts for this geographical distribution.
C
It names several isolates and nonisolates, proposes a similarity between the two categories of languages, then identifies the respective regions where languages belonging to each category are likely to be found.
D