Which of the following was a key progressive item passed by taft?
the pure food and drug act
the u. s. forestry service
the mann-elkins act
the payne-aldrich act

the Mann-Elkins Act

Explanation:

According to President Taft, the act was meant to "to regulate destructive competition and unfair trade practices". This was one of the reforms among the Progressive Era ones. It is generally agreed that the Mann–Elkins Act basically paved the way for the yet to come Communications Act of 1934.

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: