1 . The meaning of boo is to suddenly surprise someone.
Or , to show dissatisfaction and disapproval.
Also, a slang you could call your lover.
2. A boo could mean boyfriend or girlfriend .
3. Anyone calls anyone boo I guess .
A. i think is the best answer
Had to look for the missing details and here is my answer.
The area that is generally considered by Ronald Reagan as the most positive legacy is the COLD WAR. The Cold War actually happened right after the World War II. What occurred during this time was that there was a tension between the powers of the West and the East. Ronald Reagan actually served as the 40th President of the United States and he was active during this event. Hope this helps.