Explain three ways in which you think the inca system of roads strengthened the empire

1. The roads provided quick and reliable routes for the military who could get to trouble spots quickly and thus maintain law and order. 2. The roads made travel easy for civilians thus enhancing economic activities. 3. The roads made possible fairly fast communication to virtually every part of the Inca empire. The Inca road system of Peru was the most extensive, traversing the Andes mountains and reaching heights of over 5000 m above sea level and covered approximately 22, 530 km.

Ithink it's a, but i might be wrong