In the Chapter 4 Strategic Focus, Walmart's Same Store Sales

In the Chapter 4 Strategic Focus, Walmart's same store sales have been declining and those of rivals Family Dollar and Amazon have been increasing. What explains this recent change?

A) Walmart was too aggressive with its low-cost position and lost customers who wanted more upscale products.
B) Walmart changed its strategy to focused dirrerentation.
C) Amazon and Family Dollar changed their strategies to attract more upscale customers.
D) Walmart changed its strategy to attract more upscale customers.