|Question 15Verbal

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Text
When a given industry-water and electricity are two well-known examples carries high infrastructural start-up costs and other barriers that discourage competition,        of just one or two suppliers per municipality. Such industries are known as natural monopolies.
Which choice completes the text so that it conforms to the conventions of Standard English?
it often consists
A
they often consist
B
these often consist
C
this often consists
D