Using the concentration ratio , which of the industries most likely to be highly competitive?

CERTAINLY NONE OF THE ABOVE .... TRY RARE EARTH MATERIALS FAILING THAT WATER ... THERE S GOING TO BE A WORLD SHORTAGE BUT NO MARKET IS YET OFFERING IT AS A PLAY ... TO MY KNOWLEDGE ...IF YOU KNOW OF A WATER INDEX GET BACK TO ME AND I LL INVEST THE SHIRT OFF MY BACK