1. how long must candidates for senator have been citizens of the united states?
a at least four years
b at least two years
c at least six years
od at least nine years
answer is 9 years

The candidates of the senator should be D. nine years (At least).

The senate of United States includes the upper chamber which is Congress of United States along with the Representatives House; and the lower chamber comprises of legislature of the United States.

The Article 1, section 3 of the constitution states the basic three requirements for the senator candidate are:

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:

for hobos it was a very hard time most hid on the sides of the railroad tracks causing people to get bulls and get them off sometimes causing in fatal death they couldnt get people to give them money because the   people were also in need of money