When we think of volcanoes, eruptions, lava, and smoke-filled air come to mind—all occurring on land. most people are surprised to learn about the prevalence of underwater volcanoes on our planet. because the lava and smoke spilling out of an active, underwater volcano is contained by the ocean, people generally do not take note of these eruptions. however, the largest underwater volcanoes are capable of creating huge tidal waves, threatening coastal communities. the main idea of the passage is that:

To bring awareness about the underwater volcanoes.

Explanation:

The eruption of the volcanoes, and the occurrence of the earthquakes on the planet and the spilling of the lavas, and the smoke-filled air hat comes to from the vent of the large craters. As most people think that the volcanoes are present on the land areas only does not mean that they are confined to the above surface of earth they are also characterized by the deep hydrothermal vent and the  most pope thus are surprised to know about them as they don't know that they are the primary place for the origin of the first life forms n the earth in the single-celled bacteria. They generally spill out the lavas and the magmas and this is called sth submarine volcanoes and ends to occur along the mid-ocean ridges. And are known to give out an estimated 75% of the volume of the lavas on earth. They are also known as the seamounts that are created from the extinct volcanoes that occur in 1000 to 4000 meters depth of the seafloor.

answer is. c