Identify the correct statement from the following

a. Modern telecommunications turned cities like Omaha and Bangalore into new resources for the world.
b. Being only 10 hours away from most of the industrial world enabled Anchorage, Alaska to become the busiest cargo airport in the world.
c. Call centers in the U.S. set up shop in small towns to prevent large-scale migration to bigger cities.
d. Unless a city is in an advantageous location for conducting any form of business, it is difficult to boost its economy in today's world.

A