Explanation:

1 and 2

"Most of the world’s earthquakes occur along the Pacific Ring of Fire." - This statement is correct. The Pacific Ring of Fire is an area with a lot of seismic and volcanic activity, and a large number of the world's earthquakes and volcanic eruptions occur in this region.

"Nepal is at the junction of the Indian and Eurasian tectonic plates, so it is earthquake-prone." - This statement is correct. Nepal is located in a seismically active region where the Indian and Eurasian tectonic plates meet. The collision between these plates has led to the formation of the Himalayan mountain range and is associated with frequent earthquakes in the region.

"Bureau of Indian Standards, based on the past seismic history, grouped the country into five seismic zones." - This statement is not included in the correct option, but it is also correct. The Bureau of Indian Standards (BIS) has indeed classified India into seismic zones based on its past seismic history to guide earthquake-resistant construction practices.

Therefore, the correct option is 1, "1 and 2.