In an automobile company, worker A is making seat of a car, worker B is making types of a car, worker C is making body of a car; worker D is painting the car. What would you call this process?

Assembly

The correct answer is Option (4) → Assembly

The process described where different workers perform specialized tasks in the production of a car is commonly known as assembly. In assembly-line production, each worker focuses on a specific task or component, leading to increased efficiency and productivity in the manufacturing process. Therefore, the correct answer is Assembly.