In my understanding all the options are Boolean logic. Can someone elaborate why Big and Small was the correct answer for the above question which I didn't understand it.

Big and Small is the correct answer precisely because it is the wrong pair of values that DOES NOT match the Boolean logic

Hi Gaurav and Aura! Thanks for reaching out. @Aura: Thank you very much for providing an answer to Gaurav's question! Good luck and please feel free to post another question should you encounter any difficulties. Thank you. Best, Martin, The 365 Team