题目内容：

英文菜鸟提问
起初,这个复杂问题使他们感到灰心丧气,但经过仔细思考他们终于研究出了解决办法.这些翻译里面哪个是对的呢?还是都不对,如果都不对,
1.At first,this complex problem depressed them,but after careful consideration,they finally drew an conclusion
2.At first,this complex problem made them discouraged and sad.Yet,after careful consideration,they eventually find the answer.
3.Initially,the complex issues so that they feel discouraged,but after careful consideration they finally come up with a solution
4.At first,this complicated problem made them frustrated.But after the consideration finally they figured out the solution.
5.At first,this complicated problem makes them feel disappointed and frustrated,but has been cautiously considered them to finally study solution.