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Verbal·Standard English Conventions·Boundaries

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Neoclassical economic models assume that people consistently make rational economic decisions, but Francesca Gino of Harvard Business School makes no such assumption; behavioral economists such as Gino, whose research focuses on worker productivity, __________ that economic decision-making can in fact be highly irrational.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

contend

B

is contending

C

has contended

D

contends