What percentage of all e-commerce revenues does Amazon currently hold?

Amazon holds a significant share of e-commerce revenues in the United States, demonstrating its dominant position in the online retail space. The percentage indicated suggest that Amazon has managed to capture around 40% of all e-commerce revenues. This number reflects Amazon's extensive product offerings, robust logistics network, and iconic Prime membership service that enhances customer loyalty and contributes to repeated sales.

Understanding Amazon's market position allows for context regarding how it contrasts with other e-commerce platforms and traditional retailers that have also ventured online. While other companies, including eBay, Walmart, and various niche e-commerce sites, contribute to the overall percentages of e-commerce sales, none currently rival Amazon to the extent of capturing such a substantial proportion of the market. Thus, option B accurately reflects the market landscape and Amazon's strong influence within it.