Beginning in the 1970s, Research Began to Reveal That People

Beginning in the 1970s, research began to reveal that people are ________.

A) very good eyewitnesses but only if they are brought back to the same physical context where the witnessed event took place
B) not very good eyewitnesses at all: before-the-fact information can change our memories, thus recollection can actually make us forget we have a memory for something
C) mediocre eyewitnesses, since for example after-the-fact information can create flashbulb memories
D) not very good eyewitnesses at all: after-the-fact information can change our memories, and recollection can actually make us believe we have a memory for something that didn't occur