Mashaal Masha
A model created by biologist Luis Valente predicts that the rate of speciation--the rate at which new species form--on an isolated island located approximately 5,000 kilometers from the nearest mainland ________ triple the rate of speciation on an island only 500 kilometers from the mainland.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Hard
A: 

being

B: 

to be

C: 

to have been

D: 

will be

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