Arrange the sentences in a proper sequence so as to make a coherent paragraph.
A. The individual companies vary in size, from the corner grocery to the industrial giant.
B. Policies and management methods within firms range from formal, well-planned organisations and controls to slipshod dayto-day operations.
C. Various industries offer a wide array of products or services through millions of firms largely independent of each other.
D. Variety in the form of ownership contributes to diversity in capital investment, volume of business, and financial structure.