Refer the sentence into Passive: People can make metals better and stronger by mixing two or more of them together.

Варианты ответа

1. A.Metals can be make better and stronger by mixing two or more of them together.
2. B.Metals could be made better and stronger by mixing two or more of them together.
3. C.Metals are made better and stronger by mixing two or more of them together.
4. D.Metals can be made better and stronger by mixing two or more of them together.верно
5. E.You can make metals better and stronger by mixing two or more of them together.