Read the following context and choose the best option to answer the question.
Context: Then I knew something was up when everything quieted down in the dining room . How suddenly everyone wanted me to clear the table . I could hear whispers and giggling , I kept trying to hold back more and more but finally I was forced into the dining room where they had an ice cream cake ( my favorite from Carvel ) They all insisted on singing Happy Birthday to me .
Question: What may be the reason for the giggling and the whispering ?
Options: 
- They heard they 're getting a car for their birthday .
 - They are excited about the surprise .
 - They found out a secret about them .
 - They heard what they did wrong .


They are excited about the surprise .