<span>artificial intelligence
biomedical technologies
agricultural technologiesl
atomic bomb
drones</span>
CO would be Carbon Monoxide
I believe the answer is: 3. The canals and temples in the city show advanced engineering skills.
The site shows that the Aztec civilization had developed a very advanced irrigation system that utilize different elevation to obtain water for their agricultural field. Their system was later adopted by the spanish empire who invaded their territory.
