I suggest the thief -into prison. A.referred to be put B.ref

答案是A
== I SUGGESTthat the thief (who is ) referred to (should) be put into prison.
1 I SUGGESTthat thief (should) be put into prison.------我建议把小偷关起来
2 the thief is referred to (by the judge) -------(法官所）提到的小偷