Line Organization:
Line organization is a traditional and simple form of organizational structure where the authority flows vertically from top to bottom. In line organization, the business activities are divided into different departments or functions to ensure efficient operations.

Types of Business Activities:
In line organization, the business activities are typically divided into the following three types:

1. Accounts:
The accounts department is responsible for maintaining financial records, preparing financial statements, managing budgets, and conducting financial analysis. This department ensures that the financial transactions of the organization are recorded accurately and in compliance with the relevant laws and regulations.

2. Production:
The production department is responsible for the manufacturing or production process of goods or services. This department oversees the entire production cycle, including planning, organizing, and controlling the production activities. It ensures that the products or services are produced efficiently and meet the quality standards set by the organization.

3. Sales:
The sales department is responsible for generating revenue for the organization by selling its products or services. This department is involved in market research, customer acquisition, sales forecasting, sales promotion, and customer relationship management. It plays a crucial role in increasing the organization's market share and profitability.

Explanation of Correct Answer:
The correct answer is option 'A' which includes the following three types of business activities:

a) Accounts: The accounts department is responsible for managing financial records and transactions.

b) Production: The production department is responsible for manufacturing or producing goods or services.

c) Sales: The sales department is responsible for generating revenue through the sale of products or services.

These three departments represent the core functions of a business and are essential for its smooth operation. Each department has its specific role and responsibilities, but they all work together to achieve the organization's goals and objectives.

In conclusion, in line organization, the business activities are divided into accounts, production, and sales departments. This division ensures that each function is carried out efficiently and effectively, leading to the overall success of the organization.