Which of the following measures is most likely

Which of the following measures is most likely to ensure baseline equivalency in a randomized controlled trial that will test the efficacy of a new bandaging system for chronic venous leg ulcers?
   A.    
Ensuring that clinicians are unaware of whether the bandage they are applying is the experimental or control product
   B.    
Randomly assigning participants to the “new bandage” group and the “old bandage” group
   C.    
Rigorously screening potential participants to ensure they have as many characteristics in common as possible
   D.    
Setting strict criteria around the character and severity of ulcers that will be treated