|Question 17Verbal

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Text
New Zealand and Greece have two of the longest constitutions in the world. At 48,438 and 26,989 words, respectively, these ________ according to research by constitutional scholars George Tsebelis and Dominic J. Nardi, correlate with GDPs (gross domestic products) that are lower than those of countries with shorter constitutions.
Which choice completes the text so that it conforms to the conventions of Standard English?
constitutions lengths,
A
constitution's length,
B
constitutions' lengths,
C
constitutions' length,
D