Read the following context and choose the best option to answer the question.
Context: You ca n't be thinking about nothing . " " Well yeah , but I ' m not thinking of anything important . " " If it 's not important then tell me .
Question: what is meant by " thinking about nothing " ?
Options: 
- None of the above choices .
 - It means looking up in your mind 's eye the letters in the word nothing .
 - It means letting your mind wander and not focusing on anything with a sort of goal or earnestness .
 - It means practicing tantric yoga .


It means letting your mind wander and not focusing on anything with a sort of goal or earnestness .