Why is WPA2-PSK less secure than 802.1X with WPA2-PSK?

A.
Multiple users share the same password on WPA2-PSK.

B.
802.1X with WPA2-PSK uses a 2048-bit key rather than a 1024-bit key

C.
WPA2-PSK sends the initial key in clear text.

D.
802.1X with WPA2-PSK uses a more secure method for exchanging keys