What was President Regan's goal when he said: "General Secretary Gorbachev, if you seek peace, if you seek prosperity for the Soviet Union and Eastern Europe, if you seek liberalization: Come here to this gate. Mr. Gorbachev,
open this gate. Mr. Gorbachev -- Mr. Gorbachev, tear down this wall!"
a. to motivate to action
b. to change attitudes
c. to change beliefs
d. to weaken values