In 2014, what percentage of all registered vehicles were commercial trucks?

Answer: B — 23.3

The correct percentage of all registered vehicles that were commercial trucks in 2014 is 23.3%. This figure reflects the significant role that commercial trucks play in the transportation sector, demonstrating their prevalence in vehicle registration data. Commercial trucks are essential for freight transport and logistics, which is key to the economy. The number represents a notable segment of the overall vehicle population, highlighting the importance of the trucking industry within the broader context of transportation and supply chains. Other percentages may seem plausible but do not accurately represent the data from that year. For example, a percentage as high as 30.5 would suggest an overwhelming majority of vehicles are commercial trucks, which is inconsistent with historical trends in vehicle registration. Meanwhile, values like 15.0 and 18.2 do not align with the documented figures, indicating either an underestimation of commercial trucks or an oversight in recognizing their market share relative to passenger vehicles.