Detailed Instructions: In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Q: Problem: the length of a rectangle is doubled while its width is doubled . what is the % change in area ? 
Options: a ) 250 % , b ) 300 % , c ) 500 % , d ) 650 % , e ) 700 %
A:
b