Read the following context and choose the best option to answer the question.
Context: Today I completed all my visa application forms , made loads of copies , and posted it all off . Now all I ' m waiting for is the date for my US Embassy interview . I ' ve all the papers I need for the interview and more besides .
Question: What may be the reason for the interview in order to get a visa ?
Options: 
- To ensure they will fail .
 - To ensure they will be liked by the people .
 - To ensure they are being truthful .
 - To ensure they will not follow the law .


To ensure they are being truthful .