SAT Question 87d34a39: Rhetorical Synthesis answer and explanation

English - Rhetorical Synthesis - Specify Or Emphasize Detail
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While researching a topic, a student has taken the following notes:

• The National Congress of American Indians (NCAI) was founded in 1944 by representatives of fifty tribal governments. • The NCAI was created to protect the sovereignty of Indigenous tribes. • Napoleon B. Johnson (Cherokee) was the NCAI’s first president. • In 1975, the US Congress passed the Indian Self-Determination and Education Assistance Act (Public Law 96-638). • This legislation formally acknowledged tribes’ right to self-governance. • The advocacy of the NCAI was a key factor in the law’s passing.
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Difficulty:Hard
The student wants to identify an accomplishment of the NCAI. Which choice most effectively uses relevant information from the notes to accomplish this goal?