Which item is a secondary source a letter from franklin d roseevelt b a photograph of franklin d rosevelt c an online encyclopedia article about franklin d roosevelt d a recording of a speech by franklin d roosevelt

The photograph.

Because it is made by someone other than Rosevelt but it is still first-hand information.

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

hi there!

c is your answer

~courtney