sentence construction - How to say thank you for the ....?

Consider below chronological events.

I sent an E-mail to a professor and asked him a question. He answered my question. Now, I want to send him a message and say thank you ... .

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I need a short and formal sentence implying a sense of being modest, but not very modest!. e.g., "I am not a special person and his contribution to my question illustrates his great benevolence"

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I have written:

1. 
   

   
   

   Thanks for the time you considered for my question.

   
   

   
   


2. 
   

   
   

   Many thanks for the time you dedicated to my question.

   
   

   
   
   


3. 
   

   
   

   I appreciate you for including my question in your considerations.

   
   

   
   

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Do the above sentences sound awkward ? If so, any suggestion would be appreciated.