Subject: mathqa
Question: points a , b , and , c have xy - coordinates ( 20 ) , ( 812 ) , and ( 140 ) , respectively . points x , y , and z have xy - coordinates ( 60 ) , ( 84 ) , and ( 100 ) , respectively . what fraction c of the area of triangle abc is the area of triangle xyz ?
Option: 
A: 1 / 6
B: 1 / 5
C: 1 / 9
D: 1 / 3
Answer: C