The correct answer is A- Groups of people may be classified in a reasonable way. For example, having the group of teens. It's not offensive and only relates to the number of years that they have, but it doesn't mean that they have any fewer rights or anything similar just because of their age. The name teens is purely for statistical purposes.
There isn’t exactly one specific person that is recorded that invented bricks... but around 4400 BC in chengtoushan which is a walled daxi settlement.
The undreground railroads
