Choose primary concern of ecommerce business.Customer satisfactionIncreased market opportunitiescostBusiness plan

The primary concern of an ecommerce business can vary depending on the specific goals and strategies of the business. However, here is a step-by-step analysis of each option:

1. Customer Satisfaction: This is crucial for any business, not just ecommerce. Satisfied customers are more likely to become repeat customers, and they can also recommend the business to others. Ensuring customer satisfaction involves providing high-quality products or services, excellent customer service, and a user-friendly shopping experience.

2. Increased Market Opportunities: Ecommerce businesses have the advantage of reaching a global market. Therefore, increasing market opportunities can be a primary concern, especially for businesses looking to expand. This can involve targeting new demographics or geographic areas.

3. Cost: Running an ecommerce business involves various costs, including website maintenance, inventory, shipping, and marketing. Keeping these costs down while still providing value to customers can be a primary concern.

4. Business Plan: A solid business plan is essential for the success of any business. It outlines the business's goals, strategies, and financial projections. For an ecommerce business, the business plan might also include details about the online platform, marketing strategies, and growth plans.

In conclusion, all these factors are important for an ecommerce business. The primary concern would depend on the specific circumstances and goals of the business. However, without knowing more details, it's safe to say that customer satisfaction is often a top priority because it directly impacts a business's reputation and bottom line.