Read the following context and choose the best option to answer the question.
Context: It seems our sons share their father 's and my sarcastic sense of humour . Perhaps it is a survival skill , but it is a skill they have mastered nonetheless .
Question: Why would the mother be unsure whether to believe her son ?
Options: 
A. Her son is a liar .
B. Her son is deceitful .
C. Her son is a con artist .
D. None of the above choices .


D