Why is neighbor 10.1.5.5 stuck in “2WAY” state?

Refer to the exhibit.

Why is neighbor 10.1.5.5 stuck in “2WAY” state?
A . Router ID 10.1.5.5 is not reachable from R2
B . OSPF authentication has failed between R2 and 10.1.5.5
C . It is an expected behavior when OSPF network type is broadcast
D . OSPF parameters (Area ID or hello interval) are mismatched between R2 and 10.1.5.5

Answer: C

Explanation:

Reference: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13683-11.html