In the 1880s Harriet W. R. Strong, who urged water storage in dams, became the first ___ of flood control in the U.S.
A. extrovert
B. imposer
C. mediator
D. proponent
Proponent (meaning she tried to convince people to do it). Imposer would mean she was forcing people to build dams, and mediator would mean she was overseeing the process.
