Final answer:
The decision to try a child aged 13-17 as an adult is mostly based upon the severity of the crime committed.
Step-by-step explanation:
The decision to try a child aged 13-17 as an adult is mostly based upon the severity of the crime committed. When a serious crime has been committed, the legal system may determine that trying the child as an adult is necessary. The severity of the crime is an important factor in making this decision, as it reflects the potential danger and harm caused by the child's actions.