African American painter Sam Gilliam (b. █████ ██ ███████████████ ██████████ ██ ███ ██ ███ ████████ ████████ ██████████ ████ ███ ██████████ █████ ███████ █ █████ ██ █████ █████ █████ ████████ ██████████ ██ ███████████ ████ ██████ ███ █████ ███ ██████ ███ █████ █████ █████ ███ ██ █████████ ███████████ ██ ████████ ███ ████ ███████ █████ ███ ████ ██ ████████ ██████████████ ███
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In the passage, the author ██ █████████ █████████ ████
describing the motivation ██████ ███ ██████ ██ ██ ████████ ████
This best captures the primary purpose. P2 describes Gilliam’s motivation, and P3 describes the features of Gilliam’s work.
describing the political ██████ ████ ████████ ██ ████████ ████
Gilliam’s work didn’t have explicitly political themes. His work was a reaction to the expectation that African American artists produce political art. And there’s no indication that it had implicitly political ones, either.
describing the evolution ██ ██ ████████ █████ ████ █ ██████ ██ ████
Although the author does describe changes in Gilliam’s work over time in P3, this doesn’t capture the overall purpose of the passage, because it ignores P1 and P2. The author’s focus isn’t on the evolution of Gilliam’s work, but on what motivated Gilliam and the features of his work.
demonstrating that a ███████ ████████ █████ ████ ████ █████ ███████ ████████ ███████
This doesn’t capture the author’s focus on Gilliam’s art. The primary purpose isn’t to demonstrate something about Gilliam’s views; it’s to tell us about Gilliam’s art.
demonstrating that a ███████ ██████ ███ ████ ██ █████████ ███ █████████ ███████████
It’s not clear that Gilliam had any technical limitations. Since (E) isn’t supported, it can’t be the author’s primary purpose. In any case, (E) also doesn’t capture the author’s focus on Gilliam’s motivation and the features of his work.