Final answer:
Weld coupons used for practicing the striking of an arc in welding are flame-resistant. This is to ensure safety due to the high temperatures involved in welding that can spark fires and cause injuries.
Step-by-step explanation:
The question relates to the correct properties of weld coupons used for practicing the striking of an arc in welding. The correct answer is c. Are flame-resistant. Welding involves the creation of a high-temperature arc that melts the base materials along with the welding rod to fuse surfaces together. Arc striking is the process of initiating this arc to begin the welding process. It's critically important for the weld coupons, which are essentially practice pieces of metal used by welders to develop their skills, to be flame-resistant for safety reasons.
This requirement is aligned with the general precautions taken in welding, highlighted by the need for welders to use protective gear like gloves and helmets to shield themselves from the thermal energy produced during welding that could melt metal, spark fires, and cause personal injury.