Select the correct answer AABC Is dilated by a scale factor of 0.5 with the origin as the center of dilation resulting in the image AASC. If A=(2, 2) 8=(43) and C= (63)
what is the length of BC?
A 3 units
B 4 units
c 2 units
D 1 unit

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.