katie started taking daily walks. the first week she walked 1/4 of a mile each day. the second week she walked 1/2 of a mile. she increased the distance she walked each week by 1/4 of a mile until she reached her goal of 3 mile walks a day. how many weeks will it take her to reach her goal?
A. 6
B. 9
C. 12
D. 3