The sum total of all individuals, institutions and other forces that are outside the control of a business firm, but that may affect its performance is known as:

The correct option is Business Environment.

Step-by-step Explanation:

1. Definition of Business Environment: The term "Business Environment" refers to the aggregate or sum total of all factors, individuals, external institutions, and other forces that lie outside the direct control of an individual business enterprise. Even though the business has no control over these forces, they can significantly impact its operations, performance, growth, and overall survival.

2. Key Elements of the Business Environment: These external forces typically include customers, competitors, suppliers, government policies, economic conditions, technological advancements, social trends, and legal regulations. For example, a sudden change in consumer preferences or a new tax policy introduced by the government is outside the control of a firm but directly affects its sales and profitability.

3. Analyzing the Other Options:
• Business Management: Refers to the internal process of planning, organizing, directing, and controlling the resources of a business to achieve its goals. These activities are internal and within the control of the firm.
• Business Decision Making: Relates to the choices and selections made by managers regarding internal business strategies. This is an internal process under the business's control.
• Entrepreneurship Development: Focuses on the process of enhancing entrepreneurial skills and knowledge, which is a developmental aspect rather than the external surroundings of a business.

Therefore, the sum total of all external forces affecting a business firm is defined precisely as the Business Environment.