Are the ratios 48/84 and 60/96 proportional? A no because one has a question of 0.571428 and the other has a quotient of 0.625

B no because one ratio reduces two 3/7 and the other reduces too 5/8

C yes because they both reduce to the equivalent fraction 5/8

D yes because the cross product 48 times 96 and 84 times 60 are equal

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.