What circumstances might require a registrant to file a Form 8-K on an accelerated basis?

What circumstances might require a registrant to file a Form 8-K on an accelerated basis?

What circumstances might require a registrant to file a Form 8-K on an accelerated basis? 





A) Material impairments
B) Change in shell company status
C) Regulation FD
D) Sale of unregistered securities










Answer: C