Why Is Debridement And/or Amputation Often Needed to Treat Necrotizing

Why is debridement and/or amputation often needed to treat necrotizing fascitiis?

A) These procedures remove the toxins released by the causative organisms.
B) These procedures remove infected tissue and thus the source of damaging bacterial toxins.
C) S. pyogenes multiplies in dead tissue, using the breakdown products as nutrients.
D) These procedures remove infected tissue and thus the source of damaging bacterial toxins AND the procedures remove the source of nutrients for multiplying bacteria.
E) These procedures remove the source of nutrients for multiplying bacteria AND these procedures prevent the causative agent from releasing damaging toxins and enzymes.