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Especially the first part of the first episode they showed ( two half hour episodes ) . Acetylene torpedoes ! Something went wrong at an acetylene place , and sparked a fire , and all those tanks took off like missiles ! I do n't know why they did n't shut down traffic both ways instead of just one .

Question:
Why would the tanks take off like missels ?
OPTIONS: (i) Acetylene is a highly flammable gas and when pressurized is quite dangerous .. (ii) None of the above choices .. (iii) The tanks come with blimp like expanders .. (iv) The tanks make a fun game that children play make believe with ..