He/ not/ know /foreign language/ made/ it /difficult/  him / get /well-paid job/.

A. He didn’t know a foreign language, made it difficult for him to get a well-paid job.

B. He didn’t know a foreign language, which made it difficult for him to get a well-paid job.

C. He didn’t know a foreign language, which was made it difficult for him to get a well-paid job.

D. He doesn’t know a foreign language, which made it difficult for him to get a well-paid job.