105. Among the emotions on display in the negotiating room were anger for repeatedly raising the issue over and over again and preventing the raw wounds from earlier battles from ever beginning to heal.
(A) were anger for repeatedly raising the issue over and over again and preventing the raw wounds from earlier battles from ever beginning to heal
(B) was anger for repeatedly raising the issue and preventing the raw wounds from earlier battles from ever beginning to heal
(C) were anger over repeatedly raising the issue and preventing the raw wounds from earlier battles to begin healing
(D) was anger about the issue, which was raised over and over, and preventing the wounds from earlier battles, still raw, to begin healing
(E) were anger about the issue, which was raised repeatedly, and preventing the raw wounds from earlier battles to begin to heal

I don't get how B is correct. We have a conjunction "and" here so the usage of are seems appropriate. Some of them would argue that anger is the only emotion here so it has to be "was". But, it if we invert the first part to confirm that,

anger for repeatedly raising the issue over and over again was among the emotions on display in the negotiating room and preventing the raw wounds from earlier battles from ever beginning to heal.

The second part causes a sentence fragment , so it has to be one amont the "among". and if it is then "are" makes sense to me.

Can someone please explain in detail?

Thanks