Cristal rushes through her spelling assignments and her seatwork. She likes to finish first and read, but she makes careless mistakes and turns in incomplete work. Her teacher has tried several strategies that have not worked with Cristal. Now she plans to use applied behavior analysis. She tells Cristal that the goal is for her to complete the seatwork with fewer than three errors and no incompletions. She tells Cristal she will give her a token each time she meets the goal. If she achieves five tokens in a week, she will choose a reward from the surprise basket. Now what does the teacher need to do:

A) Offer the same intervention and incentives to all children in the class.
B) Alter the intervention every week to keep Cristal interested.
C) Change the goal every time Cristal earns a token.
D) Keep a record of Cristal's results and modify the plan if necessary.