--Mum we have to buy some more salt. .There is enough salt in our country.A. Why not?B

问题补充：

--Mum, we have to buy some more salt.

-- .There is enough salt in our country.

A. Why not?

B. Sure.

C. I think so.

D. Don’t worry.

答案：

A. Why not?

B. Sure.

C. I think so.

(答案→)D. Don’t worry.

解析：四个选项分别表示为什么不、当然了、我认为是这样和不要担心，根据题意选D，不要担心，我们国家有足够的盐。