请教大牛GWD 1-q32

Most of the purported health benefits of  tea comes  from antioxidants—compounds also found in beta carotene, vitamin E, and vitamin C that inhibit the formation of plaque along the body’s blood vessels.

1. comes from antioxidants—compounds also found in beta carotene, vitamin E, and vitamin C that

2. comes from antioxidants—compounds that are also found in beta carotene, vitamin E, and vitamin C, and they

3. come from antioxidants—compounds also found in beta carotene, vitamin E, and vitamin C, and

4. come from antioxidants—compounds that are also found in beta carotene, vitamin E, and vitamin C and that

5. come from antioxidants—compounds also found in beta carotene, vitamin E, and vitamin C, and they

请问各位大牛，这个题目为什么答案是D呢?  C为什么不对呢 that指代什么？

谢谢！