Jack has five toy tracks. Each truck has two doors in four tires. Which statement describes the ratio of doors to tires on each truck?
 A. The ratio is 2 to4 because for every two doors there are four tires. 
 B. The ratio is 4 to 2 because for every four tires there are two doors. 
 C. The ration is 5 to 6 because there are five toy trucks and a total of six doors and tires on each. 
 D. The ratio is 6 to 5 because there are a total of six doors and tires on each of the five toy trucks.