In Her Speech About the Benefits of Car Air Bags

In her speech about the benefits of car air bags, Karen states: "In December, 2001, The National Highway Traffic Safety Administration estimates that 7,585 people are alive today because of their airbags-over 7,500 people. That's about half the number of students at the college here. Imagine, all those lives saved, by a simple airbag." What guideline about the use of statistics is Karen following in her speech?

A) interpreting statistics accurately
B) using visual aids to present statistics
C) using secondary sources
D) making statistics understandable and memorable