In an 802.11n 2.4 GHz BSS, what prevents each station from using the full network data rate (e.g. 216.7 Mbps) for user data when multiple clients are actively exchanging data with the AP?

In an 802.11n 2.4 GHz BSS, what prevents each station from using the full network data rate (e.g. 216.7 Mbps) for user data when multiple clients are actively exchanging data with the AP?
A . Half of the bandwidth is allocated to uplink traffic and half to downlink traffic
B . All data frames must be acknowledged and the medium is shared
C . Radio receiver hardware cannot process data is quickly as it can be transmitted
D . APs do not have sufficient wired connection speeds to the LAN, even at 1 Gbps connections, with 802.11n and earlier APs

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Answer: B