Gloomy
The author's tone is is gloomy as it is discussing death.
The answer would be "to help you decipher symbols and scale."
Without the key, a lot of the symbols would be quite confusing and you wouldn't know if it was 5 miles or 500 miles. Everything else is implied throughout the map, but the key's purpose is definitely to help you decipher symbols and scale.
Answer:
C. A short story about living in an apartment in a high-rise building
Explanation:
most realistic answer
The correct answer is B . Hope this helps!