What is a reason for an EIGRP router to send an SIA reply to a peer?

What is a reason for an EIGRP router to send an SIA reply to a peer?
A . to respond to a query reporting that the prefix has gone stuck active
B . to respond to an SIA query with the alternative path requested
C . to respond to a reply reporting that the prefix has gone stuck-in-active
D . to respond to an SIA query that the router is still waiting on replies from its peers

Answer: D