The correct answer is A) Never remove the line from the rocket. This is the correct answer because the line throwing gun is designed to be fired with the line already attached. Removing the line could result in the rocket firing without the line, which could be extremely dangerous. The line provides stability and guidance for the rocket as it travels. Firing the line throwing gun without the line attached could cause the rocket to veer off course unpredictably. The other options are incorrect. B) Firing the gun at a 90-degree angle is not necessary, as the line throwing gun is designed to be fired at an appropriate angle. C) Wearing asbestos gloves is not a required precaution, as the gun should not generate high enough heat to necessitate such protection.