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 may（）

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.

正确答案：D