It is for Business law having trouble finding the best rule and the analysis

In 2013, Bakersfield PG&E decided to demolish their old power plant. PG&E hired Lincoln-Based Alpha Explosives, a well known demolition company with years of experience using high grade dynamite. The goal for the demolition was to destroy the old power plant with an internal explosion. Alpha Explosives was so certain in the process that they invited the public to watch. The week before the demolition date, Alpha Explosives sent dynamite experts to strategically place dynamite around the bottom floors of the PG&E power plant. On the day of the demolition, 300 bystanders watched as Alpha Explosives blasted the power plant. The demolition did not go according to plan, and 20 of the bystanders got injured by explosion debris. It was an explosion gone wrong. The medical costs resulted in over five million dollars. 15 of the 20 bystanders come to your office, and request for you to represent them in a class action tort lawsuit. They are wondering what would be the easiest type of tort action to bring in this case? Please use IRAC Format