Final answer:
The Decline stage is marked by declining sales, profit, and high competitive pressure in the business life cycle.
Step-by-step explanation:
The stage of the business life cycle characterized by declining sales, declining profit, and high competitive pressure is Stage 4: Decline. This stage follows the introduction, growth, and maturity stages. During the decline stage, a company may face challenges such as market saturation, technological obsolescence, increased competition, and changes in consumer preferences, all contributing to a downturn in business performance.