I concur. The answer listed as correct is wrong. NIC are used for all network communication. The statement that NICs are used only for peer-to-peer networking is false. NICs are also used for client-server communication, which is most definitely NOT peer-to-peer.
NIC, or network interface controller, is used for basically all network communication. Not just Peer-to-Peer. Peer-to-Peer networks, like bitTorrent, are but one networking use for a NIC.