Is「誰も知っている」 grammatical?


The above was recovered from [Quora](https://www.quora.com/Whats-the-
difference-between-%E8%AA%B0%E3%82%82-and-%E8%AA%B0%E3%81%A7%E3%82%82-in-
Japanese).

* * *

> **(A)** 誰も知っている

I think this is wrong and が should be added.

> **(B)** 誰も **が** 知っている

I cannot find a reputable source which explicitly says that **A** is wrong,
but I've never seen it used that way either.

