You, Mr. President, are not declaring a quarantine, but rather are setting forth an
ultimatum and threatening that if we do not give in to your demands you will use
force.
-Soviet premier Nikita Khrushchev, letter to President John F. Kennedy,
October 24, 1962

) Which U.S. action is Khrushchev challenging in this excerpt?
A) Preventing Soviet advisors from meeting with revolutionaries
South America
B) Establishing a naval blockade to stop the shipment of missiles to Cuba
C) Enforcing a ban on military aid to communist forces in North Vietnam
D) Conducting air shipments of vital supplies to East Berlin