A woman can bike 5 miles in one stretch. Her long-term goal is to bike 20 miles in one stretch.

What is an appropriate short-term goal for her?

to bike 3 miles in one stretch by the end of the first week

to bike 10 miles in one stretch by the end of the month

to bike 18 miles in one stretch by the end of the first week

to bike 25 miles in one stretch by the end of two weeks