C - https://help.mypurecloud.com/glossary/flow-outs/ Flow-outs are interactions that enter and leave a queue without getting answered by an agent and without getting disconnected.

I think that answer might be B, since the question is "... to describe such calls", it would be C if it was asked "...to describe such interactions". But that is just my opinion.

abandoned call (inbound) An abandoned call (inbound) is a call that entered the queue, but was disconnected by the caller before it reached an agent, or perhaps the system disconnected the interaction before reaching the agent.

Here is the clause they added "without being handled or terminated." That's why answer is C. Otherwise answer would be B

Tricky question, do we think it's B or C? Flow-outs are interactions that enter and leave a queue without getting answered by an agent and without getting disconnected. Flow-outs are an indication of customer service level and queue productivity. High numbers of flow-outs can indicate staffing issues or ineffective agents when used with high handle times (bullseye matching metrics). Flow-outs can include transfers to voicemail, callbacks, and any system-driven events such as in-queue flows that transfer to another queue or external party after a certain amount of time. Flow-outs can also occur if the caller opts to exit out of the queue and return to the IVR. Offered interactions are either flow-out, answered, or abandoned interactions.