Which of the following statements is supported by the map?
a. the earliest purpose of civil air routes was connecting large northern cities with large southern cities.
b. flights crossing any body of water were not scheduled until well after 1930.
c. air routes connecting the east coast to the west coast were in place before routes
that serviced the cities in the southern united states.
d. civil air routes serviced all major u. s. cities before servicing any cities in other countries.

C. Air routes connecting the East Coast to the West Coast were in place before routes that serviced the cities in the southern United States

Explanation:

The air routes were not established between all major cities across the US at the same time. The air routes started to be established in the northeastern part of the country first, and when it came to longer air routes that connected the East Coast major cities with the rest of the country, the cities that were preferred were the ones on the West Coast, not the cities on the south which were much closer. There were several reasons for this, one of which was that the East Coast cities were in better relations with the West Coast cities, and the other that it was of greater economic benefit that the two coasts are connected.

i need to see the answer to answer the question

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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