Which text from reagan’s speech, “remarks on east-west relations at brandenburg gate in west berlin,” is an example of fallacious reasoning?

a) "there is one sign the soviets can make that would be unmistakable, that would advance dramatically the cause of freedom and peace."

b) "mr. gorbachev, open this gate. mr. gorbachev, tear down this wall! "

c)"while we pursue these arms reductions, i pledge to you that we will maintain the capacity to deter soviet aggression at any level at which it might occur."

d) "in the 1950s khrushchev predicted: 'we will bury you.'"

it think its b but im not sure