Read the following context and choose the best option to answer the question.
Context: That got Evie used to her . Dr. Keck is a pro at this ! It was cool to watch her play with her foot and laugh with Evie , all the while , she 's checking out her foot movement . She 'd stick out her tongue , and Evie would do the same .
Question: Why was Dr Keck laughing with Evie .
Options: 
- The doctor was laughing because Evie was such a great comedian .
 - The doctor was laughing because Evie was ticking her foot .
 - The doctor and Evie were laughing after they saw the shape the patient 's tongue was in .
 - The doctor was laughing to lighten the mood so that the child would be agreeable while the doctor examined her .


The doctor was laughing to lighten the mood so that the child would be agreeable while the doctor examined her .