Answer:
A) ability of Big Lots to imitate Wal-Mart's tightly integrated activity map.
Step-by-step explanation:
Competitive advantage of a company is it's ability to leverage on unique capabilities and resources to gain more market share than others.
In this instance Big Lots is competing favourably by imitating unique capability of Walmart which is highly disciplined merchandise cost and inventory management system.
A business can imitate another's strategy in order to better compete with them.
For example acquiring a company to increase scale of operations to match a competitor.