I believe the answer is: Formal Operational Stage
During the Formal Operational Stage, people already developed the ability to form abstract thinking and <span> solving complex problems.
For average people, Formal operational stage started when we're around 12 years old of age and keep developing until our late adulthood.</span><span />
Assuming that it’s modern times, I would live in New York to be a dairy farmer. Although fertile land might be scarce, you wouldn’t have a lot of competition. Also, New York has a high population so there would be more demand for dairy products.
Answer:
Conservation, Classification, and Seriation
Explanation:
<span>b. Leonardo da Vinci</span>