|Question 2Verbal

Source Texts

Text
One reasonable way to evaluate the _____ of a scholar's research is to track how often other scholars refer to that research. For example, Princeton University economist Anne Case, who studies labor and health economics, is among the world's most frequently cited researchers in her specialty, indicating that her work has had a significant effect on the field.
Which choice completes the text with the most logical and precise word or phrase?
expense
A
unity
B
complexity
C
impact
D