|Question 18Verbal

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Text
Growing as large as three meters in diameter, the leaves of the giant Amazonian waterlily feature a complex network of radiating veins that provide structural ______ in thickness from the center to the edges, these veins allow the leaves to maintain their large size and buoyancy with minimal material, optimizing light capture and photosynthesis.
Which choice completes the text so that it conforms to the conventions of Standard English?
support. Decreasing
A
support decreasing
B
support, while decreasing
C
support, decreasing
D