The BEST title for this map C "Major Railroad Routes". Therefore, C "Major Railroad Routes" is correct .
The best title for the map would be C "Major Railroad Routes".
This is because the map shows a network of orange lines that crisscross the United States, which are most likely railroad routes.
The text on the map also says "1865-1888", which was a period of major railroad expansion in the United States.
"Exploring the West" is not a good title because the map does not show just the western part of the United States.
"Major Cattle Trails" is not a good title because the map does not show cattle trails.
"The First Interstates" is not a good title because the map shows railroads, not interstate highways.
Here are some other possible titles that would be more accurate and informative than the ones you provided:
Transcontinental Railroads of the United States, 1865-1888
The Iron Horse Takes Over: America's Railroad Boom, 1865-1888
From Sea to Shining Sea: The Railroads that United a Nation