Examine the two paintings below depicting famous events from american history. the first image, painted in 1940, shows the signing of the u. s. constitution in 1787. the second, painted in 1836, shows the american victory at the battle of yorktown in 1781. which of these paintings should be considered a primary source?

a. both paintings are primary sources.
b. neither painting is a primary source.
c. only siege of yorktown is a primary source.
d. only the scene at the signing of the constitution is a primary source.