Final answer:
An AME license in Canada is valid until it is suspended, surrendered, or cancelled, as long as the holder continues to adhere to the regulations and participation in ongoing training.
Step-by-step explanation:
An AME (Aircraft Maintenance Engineer) license is typically issued by aviation authorities to certify that the holder is qualified to perform aircraft maintenance. In Canada, the correct answer to the question regarding how long an AME license is valid would be a) Until suspended, surrendered, or cancelled. This means that as long as the license holder is following the regulations set by Transport Canada, including participating in required ongoing training and adhering to the standards of practice, their license will remain valid. It's important for an aircraft maintenance engineer to continuously meet the necessary requirements to ensure they can legally work on aircraft.