It's B.
Re-created in CML:
*Nov 20 22:11:01.285: OSPF-1 ADJ Gi1/0/1: First DBD and we are not SLAVE
<snip>
*Nov 20 22:11:06.066: OSPF-1 ADJ Gi1/0/1: Rcv DBD from 1.1.1.1 seq 0x1172 opt 0x52 flag 0x7 len 32 mtu 1000 state EXSTART
*Nov 20 22:11:06.066: OSPF-1 ADJ Gi1/0/1: Nbr 1.1.1.1 has smaller interface MTU
<snip>
*Nov 20 22:12:33.751: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on GigabitEthernet1/0/1 from EXSTART to DOWN, Neighbor Down: Too many retransmissions
If you want to see what MTU value the neighbor is sending: debug ip ospf adj
hth
keyword: retransmissions
Maximum Transmission Unit (MTU) is the maximum packet size that each interface or link in the network can transmit.
If the MTUs between two OSPF neighbors do not match, the neighbor relationship may not be established.
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