Who does washington blame for the introduction of slavery in the us?

The answer is C. or "no one"

Hope this helps!

The right answer is "no one". Washington had a particular point of view about slavery, and followed ideas about human rights.

Even as a slave owner, Washington proclaimed that all men were created equal and were "provided by their Creator" with "inalienable rights" to "life, liberty, and the pursuit of happiness." Moreover, throughout his existence, he continued by stating that slavery was unjust and immoral. In 1785 he had used the phrase "greed and oppression" to characterize slave interest and contrast it with the "sacred right" to emancipation. A year later Washington was amazed to find that American patriots who suffered physical punishment, hunger, and arrest at the hands of their British oppressors could inflict the same kind of suffering on their slaves. Before George Washington died in 1799, he freed his slaves and reiterated his belief that it was illegal "one man to appropriate himself for his use of the faculties of another without his consent".

the answer to your question is:

strong-mayor system