In El Salvador, a Manufacturer of Household Insecticide Told ExxonMobil

In El Salvador, a manufacturer of household insecticide told ExxonMobil Chemical salesperson Nelson Viquez that the company wanted a substitute for the kerosene it had always used in making aerosol household insecticide. Viquez worked extensively with the manufacturer to create a pilot plant and test its pesticides with the addition of ExxonMobil's Exxsol D 40 as a substitute for kerosene. ExxonMobil and the manufacturer spent a year and a half running laboratory and field tests on the new product, which has been extremely successful in Central America. Viquez acted as a(n) :

A) change agent.
B) alteration initiator.
C) adjustment moderator.
D) alteration agitator.
E) idea champion.