The leading cause of death between ages 25 and 44 is a. heart disease. b. malignant neoplasms (cancer). c. unintentional injury. d. chronic low-respiratory disease.

Your answer would be C. unintentional injury. two to three people die because of accidents and adverse effects. In 1992 and 1994 the rate increased for malignant neoplasms during a 12 year period

C. Unintentional injury. 33.6% of deaths result in car crashes alone not to mention other accidents such as suffocation, drowning, poisonings and burns. 
Hope I helped :)

Pardon me. to answer questions like this, we would have needed more information. for starters, two sentences from the excerpt that came with the question.