Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is __________________?
(A) A slow reaction
(B) A discontinuous reaction (requiring regeneration of iron by water gas intermittently)
(C) Still in development stage (by employing fluidised bed technique)
(D) All A ,

