根据对话内容，从对话后的方框中所给的A、B、C、D、E五个选项中，选出能填入空白处的最佳选项。每个选项只能选一次。

A. You're right. B. With pleasure. C. Really? D. Very delicious. E. I learned from a famous cook in Sichuan.

A: Mary, what do you think of this food?

B:  It's more delicious than the food I ate last time.

A: To tell you the truth, I cooked it.

B:  It's unbelievable.

A:  He was very strict with me, so I learned a lot.

B: So you asked me to taste your food.

A:  Would you like to be the first customer to eat my new food for free?

B: Yes, I'd love to.

A: But will you please give me some advice next time?

B: