IMO C is the Answer.

From the first we get the value of y which can be either y = 2 or 0 hence insufficient.

From two we get the interior angle at vertex is 90 degrees. Again insufficient.

Now combining the two.

As we know that the internal angle at the vertex is 90 degree and slopes of perpendicular lines are negative of the inverse. m=-(1/m1).

(1-y)/(3-x) = -(1/((1-y)/(-2-x))

1-y/3-x = 2+x/1-y
(1-y)^2 = (2+x)(3-x)i
substituting y either 0 or 2 we will get the LHS as == 1
solving the same we will get x as -2, 3. thus we can calculate the height. and thus tha area.


regards
Rav