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'.
Problem:Problem: if the circumference of a circle increases from 4 pi to 8 pi , what change occurs in the area ?
Options: ['a ) area is quadrupled', 'b ) area is tripled', 'c ) area is doubles', 'd ) area become half', 'e ) none of these']
Solution:
a