The graph below shows Kate's distance from her home (y), in miles, after a certain amount of time (x), in minutes:



Four students described Kate's motion, as shown in the table below:

Student
Description
Mary
She drives at a variable speed for 2 minutes, then drives at a constant speed for 6 minutes, and finally stops at the parking area for the next 8 minutes.
Lucy
She drives at a variable speed for 2 minutes, then drives at a constant speed for 6 minutes, and finally stops at the parking area for the next 2 minutes.
Tim
She drives at a variable speed for 2 minutes, then drives at a constant speed for 4 minutes, and finally stops at the parking area for the next 2 minutes.
Pamela
She drives at a variable speed for 2 minutes, then drives at a constant speed for 4 minutes, and finally stops at the parking area for the next 8 minutes.


Which student most accurately described Lisa's motion?

Mary
Lucy
Tim
Pamela