Final answer:
The best summary of Reagan's Berlin Wall speech is Sentence 3, focusing on the wall's symbolism of division and deprivation and Reagan's call for its removal for global freedom and prosperity.
Step-by-step explanation:
Among the sentences provided, the one that offers the best objective summary of Ronald Reagan's Berlin Wall speech is: Sentence 3
Reagan argues that the Berlin Wall represents and fosters the deprivations of Eastern Europe, and for the sake of all mankind's freedom and prosperity, it should be torn down. This sentence captures the essence of Reagan's speech as it summarizes the wall's representation of the division and deprivation, and it includes Reagan's iconic call to action for the Soviet leader, Mikhail Gorbachev, to "tear down this wall".