Final answer:
Automobile accidents are the leading cause of death among adolescents, outpacing other causes like cancer, heart disease, and genetic disorders.
Step-by-step explanation:
The question 'Most deaths that occur during adolescence are caused by:' focuses on the common causes of death among teenagers. Statistically, the leading causes of death during adolescence are accidents, with automobile accidents being a significant contributor.
While illnesses such as cancer, heart disease, and genetic disorders pose risks at various life stages, during adolescence, unintentional injuries, including those from automobile accidents, are the predominant cause of fatalities. This is evident in the patterns of death causes where it is not uncommon to see teenage driving accidents leading to tragic outcomes. It should be noted that this pattern can vary by region and socio-economic status.