re: First Job Salary Negotiation.

I've been in this spot before. The thing to remember is offer B is there and is for more money, so it's a win/win even though offer A seems better. In my experiences companies like nothing more than someone being honest with them. If they act any other way, trust me you're better off not working for them. If they can't understand that you want to put yourself in the best position possible then they'll never understand that in the future when you request a raise.

I don't see an issue doing it over the phone if they want and answer over the phone. If they did request you to come in face to face I would consider going that route, but let them know off the bat you've received another offer.

Good luck