|Question 17Verbal

Source Texts

Text
Neoclassical economic models assume that people consistently make rational economic decisions, but Katy Milkman of the University of Pennsylvania makes no such assumption; behavioral economists such as Milkman, whose research focuses on health policy,        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
has contended
B
contends
C
is contending
D