某项目提出了4个设计方案，成本和功能系数见下表，根据价值工程原理，最优方案为( )方案。

A．甲
B．乙
C．丙
D．丁

根据首字母，写出下列单词。

1. You should take off your shoes when you e______ someone's home in Japan.

2. John makes a lot of m______ from his computer games.

3. Please give my best w______ to your parents.

4. I'm glad that you are always r______ to help others. I'm proud of you.

5. The Beijing roast duck s______ nice and tastes nice, too.