The Answer will be choice b
Amusement parks were closed to people of color, motels would not accept guest that were of color
The Kepler theory about Planets
Black holes themselves can not be seen, nor do they leave trails (since emptiness does not have to be caused by a black hole), but there is evidence for black holes: scientists can see the effects of their gravity on nearby stars. The answer is B.
I would imagine it is part of the legislative branch.
Since the US government has 3 branches and its House and Senate are part of its legislative branch