Look at the line graph below, showing world grain production from 1950 to 2010.

a line graph titled total world grain production, 1950 to 2010. the x axis shows years, from 1950 to 2010, and the y axis shows million tons produced, from 0 to 2,500. the line starts at 600 in 1950, 700 in 1960, 1,000 in 1970, 1,400 in 1980, 1,800 in 1990, 1,800 in 2000, 2,200 in 2010.

which of the following statements about this graph is accurate?

world grain production has increased in every year since 1950.
the amount of grain grown between 1950 and 1980 decreased.
world grain production has generally increased between 1950 and 2010.
more grain was grown in 1950 than in any other year.

World grain production has generally increased between 1950 and 2010.

Explanation:

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: