[求助]GWD30-Q20:

GWD30-Q20:

Researchers have announced that the magnetic fields emitted by one
manufacturer’s security surveillance system, of which type there are 200,000
worldwide, can interfere with pacemakers and that this interaction can bring
on missed or irregular heartbeats, nausea, breathlessness, dizziness, and even
fainting.

1. of which type there are 200,000 worldwide, can
   interfere with pacemakers and that
           
2. of which, worldwide, there are 200,000 of that
   type, and which can interfere with pacemakers, and
           
3. of which type there are 200,000 worldwide, they
   can interfere with pacemakers and
           
4. 200,000 of which type exist worldwide, interfering
   with pacemakers, and
           
5. 200,000 of that type existing worldwide and can
   interfere with pacemakers, and

A：主句主语announce 后面接了两个that clause, 比较合理，而且前一个clause里主语谓语也都齐全

但是D, and
后面是一个完整的从句，而前面一个应该与其并列的从句却没有了谓语，所以觉得D不对。

我的看法是第二个从句有自己独立的主语（不同于第一个从句里的主语），所以用and连接的话需要前面加一个逗号；但是我实在看不出D为什么正确，因为好像第一个从句没有谓语了？