Definition: In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Input: Problem: a rectangle has 20 meter length and 15 meter breadth . find ratio between area of rectangle and square whose side is same with rectangle ' s length .
Options: ['a ) 3 : 2', 'b ) 3 : 4', 'c ) 4 : 5', 'd ) 2 : 3', 'e ) 2 : 5']
Output:
b