Final answer:
The suite of rooms in which Prince Prospero entertained his friends in "The Masque of the Red Death" was a sequence of chambers each having a distinct color and theme, with the last room decorated in black with red windows.
Step-by-step explanation:
According to "The Masque of the Red Death" by Edgar Allan Poe, the true statement about the rooms in which Prince Prospero entertained his friends is that the suite of rooms was arranged in a sequence, with each room having its own distinctive color and decorative theme.
The rooms followed each other with the easternmost room colored blue, and the sequence continued westwardly with purple, green, orange, white, and violet rooms, ultimately culminating in the final black room with red windows, which was the most eerie and feared by the guests.
Additionally, the suite was designed so that one could not see the next room without entering it, adding to the sense of mystery and surprise as guests moved from one chamber to the next.