You’re scheduled to meet a business associate for working lunch and you arrive a few minutes early to find a suitable table. 30 minutes later your associate still hasn’t arrived. You:   
A、order your lunch and eat.
B、continue waiting and fuming that your associate isn’t there.
C、tell the head waiter you're not staying and give him a card with instructions to present it to your associate to prove you were there.
D、after 15 minutes call your associate.