Final answer:
Child dependents too young to have jobs and contribute to the economy are considered to be those under 18 years old, as per the Fair Labor Standards Act of 1938.
Step-by-step explanation:
When considering the ages included under child dependents that are considered too young to have jobs and contribute to the economy, the correct answer would be B) Under 18 years old. The Fair Labor Standards Act of 1938 restricts the employment of minors and encourages schooling for individuals under the age of 18. While children between the ages of 14-16 can have limited jobs with restricted hours, they cannot fully contribute to the economy until they reach the age of 18.