Yea i think its 3 too because in science i never heard them talk about Ancient Greece
Secular countries are countries that give their citizens the right to practice & follow whatever religion they want.
This is of huge importance as now people in Nepal no longer have to follow one religion against their choice. They can also now not practice any religion & still be treated equally without any discrimination.
This declaration gives people more freedom, power & trust in their government & helps people to fight against prejudice & majoritarinism of any one religion.

Carl von Clausewitz was a Major General and military theorist born in Prussia. One of his most famous writings was Vom Kriege.
The answer is Erik Erikson
Erik Erikson was a developmental psychologist whose theories centred on psychosocial development. Erikson viewed play as a necessary factor for social development.