Read the following context and choose the best option to answer the question.
Context: Gbk and we made our way to West Mall 's Swensens , where her brothers were already waiting!While waiting for the birthday girl ... who was being distracted by her mother downstairs . She did n't see us initially .
Question: Why is the narrator trying to be so sneaky ?
Options: 
- Their friend is doing some illegal stuff .
 - Their friend is having a surprise party .
 - Their friend is going away .
 - None of the above choices .


Their friend is having a surprise party .