I took this test and got the answer right the correct answer is:<span>My aunt has visited Paris, France; Tokyo, Japan; and Sydney, Australia.</span>
The video is not provided; however, B) to be alive with all of her family , seems to be the best option
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.