How to applogise gently to a professor after an interview

[GroundTurth]

I had two interviews with Two wonderfull professors, I was exited in both of them so I need time to think. so Now I will have to pick over the other. How to appolgise gently to one them ?

 

"I appreciate the opportunity I had to interview with you today at  XXXXXXXXXXXX, and I thank you for taking time discuss with me your lab activities and future projects. It is an honour that you considered me as a possible candidate under your supervision, However I don't feel comfortable to step into two fields ( Biology and Optics ) that I might struggle with them in the future.

 

Thank you again for your time meeting me and taking time to explain about your research

 

[bsharpe269]

Can you give some more info here? Are you choosing professors for rotations or are you supposed to commit to one for your whole phd as this point?

[ss2player]

You don't need to apologize, this is grad school, this happens all the time. Thank them for the interview, don't mention the other guy/gal. You don't want a reputation as a pushover/apologizer. If they ask, say you're joining another lab.