Problem: the area of a square field is a square feet and the perimeter is p feet . if 6 a = 6 ( 2 p + 9 ) , what is the perimeter of the field , in feet ? ( here a = a ^ 2 ) 
Options: ['a ) 28', 'b ) 36', 'c ) 40', 'd ) 56', 'e ) 84']
b