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An applicant for a class A or D driver's licence must:

  1. Be at least 16 years of age

  2. Be at least 18 years of age

  3. Be at least 21 years of age

  4. Be at least 25 years of age

The correct answer is: Be at least 18 years of age

The correct answer is that an applicant for a class A or D driver's licence must be at least 18 years of age. This age requirement ensures that the individual possesses a level of maturity and responsibility necessary for operating a commercial vehicle. In Ontario, the minimum age of 18 aligns with the requirement for many other driving privileges, as it is seen as a threshold at which individuals are more likely to have developed the skills and judgment needed for handling larger vehicles safely. This regulation promotes road safety by ensuring drivers have sufficient life experience and emotional maturity to manage the complexities and responsibilities associated with operating a truck. While being at least 16 years of age might seem logical given the licensing options available for younger drivers, it does not apply to class A or D licences, which necessitate a higher maturity level due to the challenges of driving commercial vehicles. Similarly, the age requirements of 21 or 25 are not applicable to these classes of licences under standard circumstances, as they pertain to other licensing regulations in different contexts.