|Question 19Verbal

Source Texts

Text
Canada and Germany have two of the longest constitutions in the world. At 19,565 and 27,379 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' length,
A
constitutions lengths,
B
constitution's length,
C
constitutions' lengths,
D