What was one result of the United States' support of Israel during the Six-Day War in 1967?
a. The United States was forced to send troops to help defeat the Arab forces
b. The United States was forced to apologize to Arab nations for helping Israel
c. The United States found it more difficult to sell arms in the Middle East after the war
d. The United States was unable to act as a peace negotiator for the Israelis after the war