8. When welding , the operator should not carry __ a. paper in his/her pockets b. cigarette lighters c. rags d. tools

The correct answer is b. cigarette lighters. When welding, it is important for the operator to avoid carrying items that could potentially ignite and cause a fire or explosion. Cigarette lighters, due to their flammable nature and potential to ignite, should not be carried by the operator while welding.