Part A: The best description of the tone of President Reagan’s speech is D. inspiring.
Part B: The excerpt from the text that best supports the answer to Part A is D. General Secretary Gorbachev, if you seek peace … Come here to this gate! Mr. Gorbachev, open this gate! (paragraph 3).
This excerpt demonstrates an inspiring tone as Reagan directly calls out to Gorbachev, urging him to take action towards peace and freedom, symbolized by the Berlin Wall and the Brandenburg Gate. The language used conveys hope and a strong call for change, aligning with an inspiring tone.