I think it's A. I'm not 100% sure.
The birdwatchers, a noun is a person place or thing
He taught himself math, and was a maker of almanacs, an astronomer, and an author. Need to know more? Go here : http://www.biography.com/people/benjamin-banneker-9198038
Answer: an abandoned mental hospital
A. Accept
This is the best answer, 1 way to do this is to put each word in for the 'acknowledge' and see which one fits the best!
Hope this helps!
