Read the following context and choose the best option to answer the question.
Context: " " Of course , " Twelve hissed , full of contempt . He kept his eyes on the woman , who was leaning against the wall , looking slightly green . " We wo n't be on this train forever .
Question: What is the reason the woman looked slightly green .
Options: 
- The christmas lights were green .
 - None of the above choices .
 - She had a green santa hat on .
 - She had green makeup


None of the above choices .