Write the next sentence in this paragraph:

He continues welding the metal with his torch and protective gear on. He welds the metal for a very long time. then

Options are: (I). , he lifts the metal to his face and breathes in the heat while holding a welding helmet.; (II). switches off the welding torch and puts the equipment away.; (III). he places a seal on his helmet and begins welding again.; (IV). he runs his torch over the metal to make sure that it is clean and shiny.;
(II).