please list 'the following institutions'
The correct answer is A.
<em>The Israeli West Bank Barrier </em>is a separation barrier in the West Bank. It is considered a security barrier by Israel and a racial segregation and apartheid wall by the Palestinians. The vast majority of the barrier is comprised of an electric fence surrounded by a detection path, patrol road, ditch and barbed wire. It is 440 miles long.
Since the barrier, there<em> was a significant drop in terrorism in the West Bank. </em>It is attributed mainly to the large, constructed segments of the barrier which is an impediment for terrorists. This lowered the motivation of Palestinians militants to engage in terrorism.The number of suicide bombing carried out of the West Bank fell dramatically. Security cooperation between the Israelis and the Palestinian has been heightened and improved ever since.
On the other hand, the barrier<em> broke up Palestinian urban and rural blocks </em>and<em> </em>severed inter-community ties established over generations. This is considered to be a disregard of the needs of the Palestinians and their right to access their farmland.
If I understood your question correctly, then the answer is "it depends". Sometimes, individuals have a large impact on starting a war (think World War I where one individual caused the war to start), other times groups of people have also important roles in starting a war (think World War II).
