The correct answer is the following.
Although there are no options attached, we can answer the following.
Nepal is a secular state because the government allows the freedom of practicing any religion the people from Nepal wants.
That is precisely the concept of a secular state, the people from that specific country have the right to choose their religion and live its principles freely. It also means that the government does not influence any religious dogma or system.
Nepal was declared a secular state in January 2007. The decision was very important in that people no more are forced to follow one specific religious teaching or the members of the government are influenced by religious principles when creating laws and legislation.