What would be the possible cause of this failure?

Refer to the exhibit.

One of the Windows machines in your network is experiencing a Dot1x authentication failure. Windows machines are setup to acquire an IP address from DHCP server configured on the switch, which is supposed to handover IP address from 50.1.1.0/24 network, and forward AAA requests to the Radius server at 161.1.7.14.

Knowing that interface Gi0/2 on the switch may receive authentication requests from other devices and looking at the provided switch configuration.

What would be the possible cause of this failure?
A . an incorrect default route is pushed on supplicant form SW1
B . aaa dot1x authentication is not configured
C . an incorrect ip address is configured for SVI 50
D . 802.1x authentication is not enabled on interface g0/2
E . 802.1x is disabled on the switch
F . there is a radius key mismatch
G . authentication for multiple hosts not configured on the interface g0/2

Answer: C