问题：

[单选]

Refer to the exhibit. R2 and R3 are routers connected using Ethernet services from a service provider and can receive pings from each other. OSPF is configured as the routing protocol but adjacency is not happening. According to the output of the show commands in the exhibit, what could be the most likely cause of the problem?（）

A . Ethernet interfaces were configured as point-to-point.
B . Process IDs are not matching.
C . Configured bandwidths do not match on both interfaces.
D . Broadcasts and multicast are not being propagated over the Ethernet services.
E . OSPF cost does not match on both interfaces.