Final answer:
The expansion card for 802.11 network communication is a B. Network Interface Card (NIC), specifically a wireless adapter or Wi-Fi card capable of Wi-Fi connectivity.
Step-by-step explanation:
The type of expansion card that enables communication on 802.11 networks is a Network Interface Card (NIC). 802.11 networks refer to the set of standards for implementing wireless local area network (WLAN) communication, commonly referred to as Wi-Fi. A NIC designed for wireless communication, often called a Wi-Fi card or wireless adapter, supports these standards allowing a computer to connect to a network wirelessly.
An example of an application for this type of NIC would be in a laptop or a desktop computer where you would install the card to enable Wi-Fi access. This contrasts with a GPU, which is used for processing graphics; a sound card, which handles audio input and output; and a RAID controller, which is used to manage a Redundant Array of Independent Disks for data storage purposes.