9. In Reagan’s reflection about the changes Gorbachev has implemented, he asks: "Are these the beginnings of profound changes in the Soviet state? Or are they token gestures, intended to raise false hopes in the West, or to strengthen the Soviet system without changing it?" Why do you think Reagan asks this question?

Reagan placed a great deal of political pressure on the Soviet Union to make drastic changes.

Explanation:

This was part of the “Tear Down this Wall” speech made Ronald Reagan,   the 40th president of the United States of America at the Brandenburg Gate of the Berlin Wall, West Berlin, June 12, 1987. This speech was made following the following the G7 summit meeting in Venice as the president noted recent Soviet progress toward “a new policy of reform and openness. Reagan was said to have placed a great deal of political pressure on the Soviet Union to make drastic changes.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

he sent troops to protect the students as they entered the school.