Still, Jefferson freed Hemings’s children — though not Hemings herself or his approximately 150 other slaves. Washington, who had begun to believe that all men were created equal after observing the bravery of the black solders during the Revolutionary War, overcame the strong opposition of his relatives to grant his slaves their freedom in his will. Only a decade earlier, such an act would have required legislative approval in Virginia.

40. Washington’s decision to free slaves originated from his
[A] moral considerations.
[B] military experience.
[C] financial conditions.
[D] political stand.

【解析】文中最后一段的“Washington, ...observing the bravery of the black soldiers during the Revolutionary War, ...grant his slaves their freedom in his will”明确指出华盛顿给奴隶自由的原因是他们在战争中的勇敢行为，[B]“军事经历”是对其高度地概括。