decide among (someone or something)
To choose someone or something from three or more options. We've had so many good candidates for the job that I'm having a very hard time deciding among them.
decide among (someone and someone else)
and decide among (something and something else)to choose from three or more people; to choose from three or more things. I couldn't decide among all the choices on the menu. I will decide among Fred, Tom, and Alice.