During World War II, psychologists redesigned the layout of instruments in airplane cockpits to help pilots fly safely. This is an example of psychology.

human factors

Explanation: Human Factors as a discipline was Influenced by pilot errors that claimed so many lives during World War II, due to this errors that claimed many lives, engineers aimed to attempt to redesign instrument panels that was clear and easy to use for humans.

Human factors is a scientific aspect of psychology which concentrated on different topics, which includes workplace safety, human error, product design, human capability, with the goal of reducing human error and increasing general productivity.

Human factors is an area in psychology which focuses on human abilities and behavior in order to find the best ways to design products, equipment and systems for maximum safe, effective, satisfying use by humans.

d) iowa i believe is the answer

"they had a large area of land that they owned."