Emersons is a chalk material that was released in the market over a century ago. Since the release, the company has had remarkable sales and Emersons has remained unchanged. However, over the last few years, sales of Emersons have been stagnant. Competitors have begun marking prices down, and increasing their advertising and sales promotions. Emersons is most likely in the ________ stage of the PLC.
a. decline
b. growth
c. incubation
d. maturity
e. introduction