The answer is B, it is the first time black and white actors appeared on stage together on Broadway
Explanation:
As at that time, Show Boat was able to address the social menace of its time which was social evolution and black racism. With the idea of a cast that incorporated both the blacks and the white, it was the first musical on Broadway to feature both white and black performers.
A suspect must be made aware of their rights as a citizen in custody before they are interviewed. This is their right to an attorney, the right to silence, etc..
