When khrushchev demanded that us troops leave west berlin, kennedy responded by calling up additional troops. building the berlin wall. withdrawing troops from the city. launching the bay of pigs invasion.

Explanation:

In the late spring of 1961, President John F. Kennedy met with Khrushchev in Vienna to address the continuous issue of Berlin, notwithstanding the nations' contending advantages in Laos, and the subject of demilitarization. Despite the fact that they consented to advance further discussions on Laos, they found no answer for the Berlin issue. In the wake of the meeting, Khrushchev gave the United States half a year to pull back from Berlin.

Kennedy reacted by activating 150,000 reservists and expanding safeguard uses, in anticipation of a potential clash over the fate of the city.

deseasie in europe              

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.