With a distance vector routing protocol like RIPv1, when is a route in the routing table placed in the "possibly down" state?

With a distance vector routing protocol like RIPv1, when is a route in the routing table placed in the "possibly down" state?
A . When a router receives an update from its neighbor router about a network in its routing table but with a worse metric
B . When a router receives an update from its neighbor router about a network in its routing table but with a better metric
C . When a router receives an update from its neighbor router indicating that a previously accessible network is now inaccessible
D . Whenever the router receives an update from its neighbor about a newly learned network
E . Whenever the router interface that is used to reach the remote network goes down

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Answer: C