I asked the watchmaker if he could repair my watch,but he to

I asked the watchmaker if he could repair my watch,but he told me that it __.
A can be repaired B could be repaired
C could not be repaired D could repair by him
请问这道英语单选选哪个呢?
请告知为什么选那项,别的为什么不选?最后还请翻译一下这句话..