Marge treated three groups of balding men with three different experimental hair

Marge treated three groups of balding men with three different experimental hair restorers. The data below show mean hairs per square centimeter before and after treatment. Which set of data are consistent with the hypothesis that Treatment A is most effective in restoring hair?
   A. Before treatment: A 10, B 23, C 15. After treatment: A 5, B 4, C 32.    
   B. Before treatment: A 10, B 23, C 15. After treatment: A 33, B 23, C 70.    
   C. Before treatment: A 10, B 23, C 15. After treatment: A 12, B 23, C 25.    
   D. Before treatment: A 10, B 23, C 15. After treatment: A 30, B 15, C 25.    
   E. Before treatment: A 10, B 23, C 15. After treatment: A 10, B 27, C 15.