I NEED HELP WITH THE QUESTION ASAP PLZ ANSWER RIGHT DONT DO IT FOR THE POINTS I NEED HELP WITH THE QUESTION THANK YOU!!!!
Why are towers built every 30 miles to send radio signals back to earth?

A to catch secret signals from other countries

B to catch signals that do not travel more than 30 miles

C to catch signals from other radio stations

D to catch signals that travel in straight lines​