Answer:
Option C. a conference call
Explanation.
A conference call is a telephone call in which more than two people have a conversation simultaneously. Conference calls enables large number of people to connect with each other through a conference bridge to have a conversation, which is most importantly a server that plays a role of a telephone and can answer and accommodate multiple calls simultaneously. In a conference call which is generally a telephone call in which someone talks to various people at the same time. Conference calls have different setups. It depends how a conference call setup is built to communicate with each other. Some of them are in which every person can participate and talk at the same time or the call may be setup so that the called participants can only listen and cannot speak. As in this case the team clearly wants a conversation on a specific agenda so conference call is the only best option for them.
