Final answer:
Welder cards issued by the Canadian Welding Bureau are owned by the welders themselves, serving as their professional qualifications. The correct answer for the question is option (B)
Step-by-step explanation:
The owner of the welder cards issued by the Canadian Welding Bureau (CWB) is B) the welder themselves. These cards, often referred to as welder qualification cards, serve as proof that the individual welder has been tested and has met the necessary standards for a specific welding process as per the CWB's requirements. The card is important for the welder's professional credentials and is carried by them to demonstrate their qualification when seeking employment or verifying their status for a specific welding job.