As of 2015, how many motor carriers are there in the U.S.?

Answer: B — 1.48 million

The correct answer reflects that there were approximately 1.48 million motor carriers operating in the U.S. in 2015. This figure includes a variety of companies and operators involved in both interstate and intrastate commerce, covering a wide range of vehicle types, from small local delivery services to large national trucking companies. This number illustrates the vast scale of the trucking industry and its critical role in the U.S. economy, providing essential transportation services for goods across the country. Understanding this statistic is important for recognizing the industry's size and the regulatory framework that supports its operation, which can be vital knowledge for those involved in logistics and transportation planning.