Verified Answer :

DarkBlue

\(\frac{red}{blue} = \frac{36}{64} ^{(2} = \frac{18}{32} ^{(2} = \frac{9}{16}\)
So the correct answer is B
Have a nice day!!! ^^

VenusRetrograde

Answer=B

36 red marbles
64 blue marbles

red marbles:blue marbles
36:64
now lets simplify the ratio by dividing both numbers by 2
18:32
continue simplifying by dividing both sides by 2 again...
9:16

The ratio of red to blue marbles is 9:16