Final answer:
To obtain a school bus license in Canada, a person must not have been convicted under section 4 or 5 of the Narcotic Control Act within the last three years.
Step-by-step explanation:
In relation to obtaining a license to drive a school bus in Canada, if a person has been convicted or found guilty under section 4 or 5 of the Narcotic Control Act, there is a specified period during which they cannot obtain such a license. The correct answer to the question, 'You cannot obtain a license to drive a school bus if you have been convicted or found guilty under section 4 or 5 of the Narcotic Control Act of Canada within the last...?' is b. Three years. It is important for drivers of school buses to have a clear record for a considerable period due to the responsibility of transporting children.