What Prompted the American National Exhibition in Moscow in the Summer

What prompted the American National Exhibition in Moscow in the summer of 1959?

A) American manufacturers wanted to explore the Soviet and Eastern European market and saw this as an advertising opportunity.
B) During an interview on Russian television, Richard Nixon had dared the Soviet Union to allow Americans to show their products.
C) Soviet Premier Nikita Khrushchev had suggested on American television that the US was restricting cultural relations between the two rivals.
D) The exhibit had been a tradition in US-Russian relations since before the creation of the Soviet Union.