Task: Question Answering
Input (English): Problem: the points a ( 0 , 0 ) , b ( 0 , 4 a - 2 ) and c ( 2 a + 1 , 2 a + 6 ) form a triangle . if angle abc = 90 , what is the area of triangle abc ? 
Options: a ) 58 , b ) 70 , c ) 63 , d ) 65 , e ) 72
Output (English): c