根据句意及首字母或汉语提示完成单词

小题1:Luckily, the car a______ wasn’t serious and nobody was badly hurt.

小题2:I will have an i______ tomorrow, so I need to get ready for it.

小题3:This is a piece of __________________(令人失望的) news.

小题4:Let’s have a s_________party for Lana on her birthday. She will be very happy.

小题5:I think that’s a good _________(决定).

某投资项目预计未来收益前景为“很好”、“一般”和“较差”的概率分别为30%、50%和20%，相应的投资收益率分别为30%、12%和6%，则该项投资的预期收益率为(　)。

A．12%

B．16%

C．16.2%

D．30%