Which address are OSPF hello packets addressed to on point-to-point networks?

Which address are OSPF hello packets addressed to on point-to-point networks?
A . 224.0.0.5
B . 172.16.0.1
C . 192.168.0.5
D . 223.0.0.1
E . 254.255.255.255

Answer: A

Explanation:

Why Does the show ip ospf neighbor Command Reveal Neighbors in the Init State?

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f11.shtml OSPF hello packets have a destination address of 224.0.0.5 (the all ospf routers multicast address).