Were are earthquakes most likely to occur

Over 80 per cent of large earthquakes occur around the edges of the Pacific Ocean, an area known as the 'Ring of Fire'; this where the Pacific plate is being subducted beneath the surrounding plates. The Ring of Fire is the most seismically and volcanically active zone in the world.

earthquakes are most likely to occur near the coast. (ocean)

Explanation:

So many large earthquakes occur near california and on islands etc.

Hope I could help!

a chemical reaction happens

explanation:

the answer is option a.