The correct answer is A. Progressive.
Young people are more likely to be progressive because they are more open to new ideas and experiences. They are also more likely to be idealistic and believe that they can make a difference in the world.
Aggressiveness is not necessarily a characteristic of young people. It can be found in people of all ages.
Security is also not necessarily a characteristic of young people. Some young people may feel secure, while others may feel insecure.
Conservatism is a political ideology that is often associated with older people. It is characterized by a belief in tradition and order.
In conclusion, the correct answer is A. Progressive. Young people are more likely to be progressive because they are more open to new ideas and experiences. They are also more likely to be idealistic and believe that they can make a difference in the world.