An aeronautical engineer works using technology, and theory. They are known for designing aircraft and propulsion systems. Which requires mathematical skills but also patience. However, I would go with D.
Not exactly because you dont have to be exactly skillled to earn a living many people that have no little to no skills still a decent amount to be a living.
The per capita income can not reflect the true state of economic development because if the income of a particular group have increased or have become rich and the income of other groups remain the same, it will reflect an increase in the per capita income.
The dating of artifacts is done by a carbon dating age system based on
the development of tools and technology. They used the carbon that is left in
the artifacts of the deceased.
