<span><span>a.an article written by a granddaughter of someone who participated in the event</span><span>b.an interview today with someone who saw the event take place</span><span>c.a letter published in the editorial section of a newspaper one month after the event occurred</span><span>d.<span>an account from two eyewitnesses recorded on the day the event happened
</span></span></span>
One of the most dramatic standoffs in the history of the Cold War begins as the Soviet Union blocks all road and rail traffic to and from West Berlin