Task: Question Answering
Input (English): Problem: in a rectangular coordinate system , what is the area of a triangle whose vertices have the coordinates ( - 1 , 0 ) , ( 7 , 4 ) , and ( 7 , - 4 ) ? 
Options: ['a ) 29', 'b ) 30', 'c ) 31', 'd ) 32', 'e ) 33']
Output (English): d