In seventeenth century poland, the most significant political influence was exercised by the
a) nobility
b) town councils
c) polish monarch
d) russian monarch

A) Nobility.

Explanation:

The Parliament or Sejm was the body charged with the election of the king. The crown was not hereditary, the king had to consult many important policy issues with the parliament. So, the Polish monarchy was weak. This system was often plagued by corruption and bribes, and as some historians state, it caused chaos and an ineffective monarchy. These are key factors in the disappearance of Poland from the map of Europe in the late 18th century: It was partitioned among Prussia, Russia and Austria.

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:

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.