|Question 15Verbal

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Text
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. [Blank] 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?
contend
A
is contending
B
has contended
C
contends
D