|Question 18Verbal

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Text
Neoclassical economic models assume that people consistently make rational economic decisions, but Laura Gee of Tufts University makes no such assumption; behavioral economists such as Gee, whose research focuses on charitable giving, ______ 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?
has contended
A
contends
B
is contending
C
contend
D