What Has Been Demonstrated by Researchers Who Investigated the Accuracy

What has been demonstrated by researchers who investigated the accuracy of flashbulb memories following the terrorist attacks of September 11,2001

A)  Flashbulb memories are more vivid because they contain hallucinatory (and therefore inaccurate) details. 
B)  Flashbulb memories are more vivid and more accurate than typical memories. 
C)  Flashbulb memories contain more visual information than typical memories, which makes them less accurate for semantic encoding. 
D)  Flashbulb memories may be more vivid and detailed, but they are otherwise similar to other types of long-term memory.