A、R1 has EIGRP neighbors reachable via S0/0 and S0/1, but not via S0/2, so it is not included.
B、S0/2 may currently be in a state other than up/up.
C、The network 10.0.0.0 command requires the use of mask 255.0.0.0 due to EIGRP being classful by default.
D、S0/2 may be configured as a passive inter face.