D. He focused on gaining economic independence for African Americans.
Explanation:
Booker T. Washington was a former slave who took the leadership of the African-American population during the time of reconstruction in the southern United States. At that time, the south is devastated after the defeat in the war of secession and the blacks, although liberated, were without any social protection, totally thrown to their own devices. Booker T. Washington, emerged at that time as a major influence for blacks, as he had achieved some influence among white families, he became a voice that influenced the creation of technical education for blacks, thus they would have economic independence.
The three fundamental rights mentioned in the Declaration of Independence that were bestowed upon people by birth are Life, Liberty, and the Pursuit of Happiness.
