Rachel Terry, regional manager at Wilcon Solvents, Inc., compares last quarter's sales with the levels projected in the firm's marketing plan. She identifies three solvent brands whose sales are below projections and initiates a series of inquiries to discover the reasons for the shortfall. Ms. Terry is engaged in which stage of the strategic marketing process?
a. environmental scanning
b. opportunity analysis
c. planning
d. implementation
e. control
Answer: e. control